Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n
\u01a0\u0309 chu\u0309 \u0111\u00ea\u0300 l\u00e2\u0300n na\u0300y, Vietlearn se\u0303 cu\u0300ng v\u01a1\u0301i ca\u0301c ba\u0323n \u0111i ti\u0300m hi\u00ea\u0309u v\u00ea\u0300 t\u00ednh ch\u1ea5t tia ph\u00e2n gi\u00e1c c\u1ee7a m\u1ed9t g\u00f3c. \u0110\u00e2y la\u0300 m\u00f4\u0323t trong nh\u01b0\u0303ng ki\u00ea\u0301n th\u01b0\u0301c hi\u0300nh ho\u0323c v\u00f4 cu\u0300ng quan tro\u0323ng cu\u0309a Toa\u0301n hi\u0300nh ho\u0323c l\u01a1\u0301p 7. Tia ph\u00e2n gia\u0301c la\u0300 gi\u0300? Nh\u01b0\u0303ng ti\u0301nh ch\u00e2\u0301t c\u00e2\u0300n chu\u0301 y\u0301 li\u00ean quan t\u01a1\u0301i tia ph\u00e2n gia\u0301c cu\u0309a m\u00f4\u0323t go\u0301c se\u0303 \u0111\u01b0\u01a1\u0323c Vietlearn cung c\u00e2\u0301p \u0111\u00e2\u0300y \u0111u\u0309 cho ba\u0323n \u0111o\u0323c.<\/p>\n\n\n\n
T\u00ednh ch\u1ea5t tia ph\u00e2n gi\u00e1c c\u1ee7a m\u1ed9t g\u00f3c<\/p>\n\n\n\n
Tia ph\u00e2n gia\u0301c la\u0300 gi\u0300?<\/p>\n\n\n\n
Tia ph\u00e2n gia\u0301c cu\u0309a m\u00f4\u0323t go\u0301c \u0111\u01b0\u01a1\u0323c \u0111i\u0323nh nghi\u0303a m\u00f4\u0323t ca\u0301ch t\u01b0\u01a1ng \u0111\u00f4\u0301i ro\u0303 ra\u0300ng. No\u0301 la\u0300 tia n\u0103\u0300m gi\u01b0\u0303a 2 ca\u0323nh cu\u0309a 1 go\u0301c va\u0300 chia go\u0301c \u0111o\u0301 tha\u0300nh 2 go\u0301c b\u0103\u0300ng nhau.<\/p>\n\n\n\n
Vi\u0301 du\u0323: Ta co\u0301 go\u0301c xOy. N\u00ea\u0301u tia On n\u0103\u0300m \u01a1\u0309 gi\u01b0\u0303a 2 tia Ox va\u0300 Oy \u0111\u00f4\u0300ng th\u01a1\u0300i chia go\u0301c xOy tha\u0300nh 2 go\u0301c b\u0103\u0300ng nhau thi\u0300 ng\u01b0\u01a1\u0300i ta go\u0323i tia On la\u0300 tia ph\u00e2n gia\u0301c cu\u0309a go\u0301c xOy.<\/p>\n\n\n\n
Ca\u0301ch ve\u0303 tia ph\u00e2n gia\u0301c cu\u0309a m\u00f4\u0323t go\u0301c d\u1ef1a v\u00e0o t\u00ednh ch\u1ea5t tia ph\u00e2n gi\u00e1c c\u1ee7a m\u1ed9t g\u00f3c<\/p>\n\n\n\n
\u0110\u00ea\u0309 ve\u0303 \u0111\u01b0\u01a1\u0323c tia ph\u00e2n gia\u0301c cu\u0309a m\u00f4\u0323t go\u0301c b\u00e2\u0301t ky\u0300 thi\u0300 ca\u0301c ba\u0323n \u0111o\u0323c co\u0301 th\u00ea\u0309 la\u0300m theo 2 ca\u0301ch nh\u01b0 sau:<\/p>\n\n\n\n
Ca\u0301ch 1: S\u01b0\u0309 du\u0323ng th\u01b0\u01a1\u0301c \u0111o \u0111\u00f4\u0323. \u0110\u0103\u0323t \u0111i\u00ea\u0309m 0 tr\u00ean th\u01b0\u01a1\u0301c \u0111o \u0111\u00f4\u0323 tru\u0300ng v\u01a1\u0301i \u0111i\u0309nh cu\u0309a go\u0301c. L\u00e2\u0301y s\u00f4\u0301 \u0111o go\u0301c chia \u0111\u00f4i, \u0111a\u0301nh d\u00e2\u0301u \u0111i\u00ea\u0309m chia \u0111\u00f4i. Du\u0300ng th\u01b0\u01a1\u0301c n\u00f4\u0301i t\u01b0\u0300 \u0111i\u0309nh cu\u0309a go\u0301c t\u01a1\u0301i \u0111i\u00ea\u0309m \u0111a\u0303 \u0111a\u0301nh d\u00e2\u0301u ta \u0111\u01b0\u01a1\u0323c tia ph\u00e2n gia\u0301c.<\/p>\n\n\n\n
Ca\u0301ch ve\u0303 tia ph\u00e2n gia\u0301c cu\u0309a go\u0301c d\u1ef1a v\u00e0o t\u00ednh ch\u1ea5t tia ph\u00e2n gi\u00e1c c\u1ee7a m\u1ed9t g\u00f3c<\/p>\n\n\n\n
Ca\u0301ch 2: S\u01b0\u0309 du\u0323ng ph\u01b0\u01a1ng pha\u0301p g\u00e2\u0301p gi\u00e2\u0301y. S\u01b0\u0309 du\u0323ng gi\u00e2\u0301y co\u0301 khu\u00f4n la\u0300 hi\u0300nh vu\u00f4ng ho\u0103\u0323c hi\u0300nh ch\u01b0\u0303 nh\u00e2\u0323t. Ve\u0303 m\u00f4\u0323t go\u0301c b\u00e2\u0301t ky\u0300 trong \u0111o\u0301 co\u0301 m\u00f4\u0323t tia la\u0300 ca\u0323nh cu\u0309a t\u01a1\u0300 gi\u00e2\u0301y. G\u00e2\u0301p gi\u00e2\u0301y sao cho 2 tia cu\u0309a go\u0301c tru\u0300ng v\u01a1\u0301i nhau. N\u00ea\u0301p g\u00e2\u0301p ta\u0323o tha\u0300nh chi\u0301nh la\u0300 tia ph\u00e2n gia\u0301c cu\u0309a go\u0301c \u0111a\u0303 ve\u0303.<\/p>\n\n\n\n
T\u00ednh ch\u1ea5t tia ph\u00e2n gi\u00e1c c\u1ee7a m\u1ed9t g\u00f3c<\/p>\n\n\n\n
Tia ph\u00e2n gia\u0301c cu\u0309a m\u00f4\u0323t go\u0301c co\u0301 2 ti\u0301nh ch\u00e2\u0301t t\u01b0\u01a1ng \u0111\u00f4\u0301i quan tro\u0323ng ma\u0300 ba\u0323n \u0111o\u0323c c\u00e2\u0300n n\u0103\u0301m \u0111\u01b0\u01a1\u0323c. Cu\u0323 th\u00ea\u0309 bao g\u00f4\u0300m:<\/p>\n\n\n\n
Tia ph\u00e2n gia\u0301c cu\u0309a m\u00f4\u0323t go\u0301c chia go\u0301c \u0111o\u0301 tha\u0300nh 2 go\u0301c nho\u0309 co\u0301 s\u00f4\u0301 \u0111o b\u0103\u0300ng nhau va\u0300 b\u0103\u0300ng m\u00f4\u0323t n\u01b0\u0309a go\u0301c ban \u0111\u00e2\u0300u.<\/p>\n\n\n\n
T\u00e2\u0301t ca\u0309 ca\u0301c \u0111i\u00ea\u0309m n\u0103\u0300m tr\u00ean tia ph\u00e2n gia\u0301c cu\u0309a m\u00f4\u0323t go\u0301c thi\u0300 ca\u0301ch \u0111\u00ea\u0300u 2 tia ta\u0323o tha\u0300nh go\u0301c.<\/p>\n\n\n\n
T\u00ednh ch\u1ea5t ba \u0111\u01b0\u1eddng ph\u00e2n gi\u00e1c c\u1ee7a tam gi\u00e1c<\/p><\/blockquote>\n\n\n\n
D\u00e2\u0301u hi\u00ea\u0323u nh\u00e2\u0323n bi\u00ea\u0301t tia ph\u00e2n gia\u0301c cu\u0309a m\u00f4\u0323t go\u0301c<\/p>\n\n\n\n
D\u01b0\u0323a va\u0300o ca\u0301c ti\u0301nh ch\u00e2\u0301t k\u00ea\u0309 tr\u00ean, chu\u0301ng ta co\u0301 th\u00ea\u0309 d\u00ea\u0303 da\u0300ng li\u00ea\u0323t k\u00ea ra ca\u0301c d\u00e2\u0301u hi\u00ea\u0323u \u0111\u00ea\u0309 nh\u00e2\u0323n bi\u00ea\u0301t tia ph\u00e2n gia\u0301c cu\u0309a m\u00f4\u0323t go\u0301c.<\/p>\n\n\n\n
Tia b\u00e2\u0301t ky\u0300 chia m\u00f4\u0323t go\u0301c tha\u0300nh 2 go\u0301c b\u0103\u0300ng nhau va\u0300 co\u0301 s\u00f4\u0301 \u0111o b\u0103\u0300ng m\u00f4\u0323t n\u01b0\u0309a go\u0301c \u0111a\u0303 cho thi\u0300 la\u0300 tia ph\u00e2n gia\u0301c cu\u0309a go\u0301c \u0111o\u0301.<\/p>\n\n\n\n
Tia n\u0103\u0300m trong m\u00f4\u0323t go\u0301c va\u0300 ca\u0301c \u0111i\u00ea\u0309m tr\u00ean \u0111o\u0301 ca\u0301ch \u0111\u00ea\u0300u 2 tia ta\u0323o tha\u0300nh go\u0301c thi\u0300 la\u0300 tia ph\u00e2n gia\u0301c cu\u0309a m\u00f4\u0323t go\u0301c.<\/p>\n\n\n\n
D\u00e2\u0301u hi\u00ea\u0323u nh\u00e2\u0323n bi\u00ea\u0301t tia ph\u00e2n gia\u0301c<\/p>\n\n\n\n
Ca\u0301c ba\u0300i t\u00e2\u0323p v\u00ea\u0300 t\u00ednh ch\u1ea5t tia ph\u00e2n gi\u00e1c c\u1ee7a m\u1ed9t g\u00f3c<\/p>\n\n\n\n
Cu\u0300ng gia\u0309i ba\u0300i t\u00e2\u0323p v\u01a1\u0301i Vietlearn \u0111\u00ea\u0309 n\u0103\u0301m b\u0103\u0301t t\u00f4\u0301t h\u01a1n nh\u01b0\u0303ng ki\u00ea\u0301n th\u01b0\u0301c v\u00ea\u0300 ti\u0301nh ch\u00e2\u0301t tia ph\u00e2n gia\u0301c:<\/p>\n\n\n\n
C\u00e2u 1: \u0110i\u0323nh nghi\u0303a \u0111\u00e2\u0300y \u0111u\u0309 nh\u00e2\u0301t v\u00e0 t\u00ednh ch\u1ea5t tia ph\u00e2n gi\u00e1c c\u1ee7a m\u1ed9t g\u00f3c?<\/p>\n\n\n\n
Tia ph\u00e2n gia\u0301c cu\u0309a m\u00f4\u0323t go\u0301c n\u0103\u0300m gi\u01b0\u0303a 2 tia ta\u0323o tha\u0300nh go\u0301c.<\/p>\n\n\n\n
Tia ph\u00e2n gia\u0301c cu\u0309a m\u00f4\u0323t go\u0301c n\u0103\u0300m gi\u01b0\u0303a 2 tia ta\u0323o tha\u0300nh go\u0301c va\u0300 chia go\u0301c \u0111o\u0301 tha\u0300nh 2 go\u0301c b\u0103\u0300ng nhau.<\/p>\n\n\n\n
Tia ph\u00e2n gia\u0301c cu\u0309a m\u00f4\u0323t go\u0301c chia go\u0301c \u0111o\u0301 tha\u0300nh 2 go\u0301c b\u0103\u0300ng nhau.<\/p>\n\n\n\n
Tia ph\u00e2n gia\u0301c cu\u0309a m\u00f4\u0323t go\u0301c chia go\u0301c \u0111o\u0301 tha\u0300nh 2 go\u0301c co\u0301 s\u00f4\u0301 \u0111o g\u00e2\u0301p nhau 2 l\u00e2\u0300n.<\/p>\n\n\n\n
Tia ph\u00e2n gia\u0301c cu\u0309a m\u00f4\u0323t go\u0301c n\u0103\u0300m gi\u01b0\u0303a 2 tia ta\u0323o tha\u0300nh go\u0301c va\u0300 chia go\u0301c \u0111o\u0301 tha\u0300nh 2 go\u0301c b\u0103\u0300ng nhau.<\/p>\n\n\n\n
Cho\u0323n B.<\/p>\n\n\n\n
C\u00e2u 2: Go\u0301c xOy co\u0301 s\u00f4\u0301 \u0111o\u0301 b\u0103\u0300ng 120 \u0111\u00f4\u0323. Cho tia ph\u00e2n gia\u0301c Oz. S\u00f4\u0301 \u0111o cu\u0309a go\u0301c xOz la\u0300?<\/p>\n\n\n\n
60 \u0111\u00f4\u0323.<\/p>\n\n\n\n
40 \u0111\u00f4\u0323.<\/p>\n\n\n\n
80 \u0111\u00f4\u0323.<\/p>\n\n\n\n
55 \u0111\u00f4\u0323.<\/p>\n\n\n\n
Tia ph\u00e2n gia\u0301c Oz chia go\u0301c xOy tha\u0300nh 2 go\u0301c b\u0103\u0300ng nhau co\u0301 s\u00f4\u0301 \u0111o b\u0103\u0300ng m\u00f4\u0323t n\u01b0\u0309a s\u00f4\u0301 \u0111o cu\u0309a go\u0301c xOy => S\u00f4\u0301 \u0111o go\u0301c xOz la\u0300 60 \u0111\u00f4\u0323.<\/p>\n\n\n\n
Cho\u0323n A.<\/p>\n\n\n\n
C\u00e2u 3: Cho go\u0301c xOy la\u0300 go\u0301c vu\u00f4ng. Tia ph\u00e2n gia\u0301c Oz cho s\u00f4\u0301 \u0111o cu\u0309a go\u0301c yOz la\u0300?<\/p>\n\n\n\n
60 \u0111\u00f4\u0323.<\/p>\n\n\n\n
45 \u0111\u00f4\u0323.<\/p>\n\n\n\n
70 \u0111\u00f4\u0323.<\/p>\n\n\n\n
50 \u0111\u00f4\u0323.<\/p>\n\n\n\n
Go\u0301c xOy la\u0300 go\u0301c vu\u00f4ng n\u00ean co\u0301 s\u00f4\u0301 \u0111o b\u0103\u0300ng 90 \u0111\u00f4\u0323. S\u00f4\u0301 \u0111o go\u0301c yOz b\u0103\u0300ng m\u00f4\u0323t n\u01b0\u0309a s\u00f4\u0301 \u0111o go\u0301c xOy va\u0300 b\u0103\u0300ng 45 \u0111\u00f4\u0323.<\/p>\n\n\n\n
Cho\u0323n B.<\/p>\n\n\n\n
C\u00e2u 4: Cho go\u0301c xOy b\u0103\u0300ng 120 \u0111\u00f4\u0323. Ve\u0303 2 tia Oz va\u0300 Ot sao cho Oz la\u0300 tia ph\u00e2n gia\u0301c cu\u0309a go\u0301c xOy, Ot vu\u00f4ng go\u0301c v\u01a1\u0301i Oz. Ti\u0301nh s\u00f4\u0301 \u0111o go\u0301c xOz va\u0300 go\u0301c xOt.<\/p>\n\n\n\n
xOz = 60 \u0111\u00f4\u0323 ; xOt = 40 \u0111\u00f4\u0323.<\/p>\n\n\n\n
xOz = 60 \u0111\u00f4\u0323 ; xOt = 30 \u0111\u00f4\u0323.<\/p>\n\n\n\n
xOz = 60 \u0111\u00f4\u0323 ; xOt = 40 \u0111\u00f4\u0323.<\/p>\n\n\n\n
xOz = 30 \u0111\u00f4\u0323 ; xOt = 60 \u0111\u00f4\u0323.<\/p>\n\n\n\n
Oz la\u0300 tia ph\u00e2n gia\u0301c cu\u0309a go\u0301c xOy n\u00ean go\u0301c xOz b\u0103\u0300ng 60 \u0111\u00f4\u0323. Tia Ot vu\u00f4ng go\u0301c v\u01a1\u0301i Oz n\u00ean go\u0301c xOt = 90 \u0111\u00f4\u0323 \u2013 60 \u0111\u00f4\u0323 = 30 \u0111\u00f4\u0323.<\/p>\n\n\n\n
Cho\u0323n B.<\/p>\n\n\n\n
C\u00e2u 5: Cho go\u0301c AOB co\u0301 s\u00f4\u0301 \u0111o la\u0300 170 \u0111\u00f4\u0323. Ke\u0309 tia ph\u00e2n gia\u0301c Oy. Ho\u0309i go\u0301c BOy la\u0300 go\u0301c gi\u0300?<\/p>\n\n\n\n
go\u0301c nho\u0323n<\/p>\n\n\n\n
go\u0301c tu\u0300<\/p>\n\n\n\n
go\u0301c vu\u00f4ng<\/p>\n\n\n\n
go\u0301c be\u0323t<\/p>\n\n\n\n
Oy la\u0300 tia ph\u00e2n gia\u0301c cu\u0309a go\u0301c AOB n\u00ean s\u00f4\u0301 \u0111o go\u0301c Boy =1\/2AOB = 85 \u0111\u00f4\u0323 =>> go\u0301c BOy la\u0300 go\u0301c nho\u0323n.<\/p>\n\n\n\n
C\u00e2u 6: Go\u0301c xOy co\u0301 s\u00f4\u0301 \u0111o b\u0103\u0300ng 120 \u0111\u00f4\u0323. Ke\u0309 tia ph\u00e2n gia\u0301c Oz. Tia Ot h\u01a1\u0323p v\u01a1\u0301i Ox m\u00f4\u0323t go\u0301c b\u0103\u0300ng 30 \u0111\u00f4\u0323. S\u00f4\u0301 \u0111o go\u0301c tOz la\u0300 bao nhi\u00eau?<\/p>\n\n\n\n
80 \u0111\u00f4\u0323.<\/p>\n\n\n\n
85 \u0111\u00f4\u0323.<\/p>\n\n\n\n
90 \u0111\u00f4\u0323.<\/p>\n\n\n\n
30 \u0111\u00f4\u0323.<\/p>\n\n\n\n
Tia ph\u00e2n gia\u0301c Oz cho go\u0301c xOz = 60 \u0111\u00f4\u0323. Ma\u0300 go\u0301c tOx b\u0103\u0300ng 30 \u0111\u00f4\u0323 => go\u0301c tOz = 90 \u0111\u00f4\u0323.<\/p>\n\n\n\n
Cho\u0323n C.<\/p>\n\n\n\n
Toa\u0300n b\u00f4\u0323 ba\u0300i \u0111o\u0323c la\u0300 nh\u01b0\u0303ng ki\u00ea\u0301n th\u01b0\u0301c li\u00ean quan t\u01a1\u0301i chu\u0309 \u0111\u00ea\u0300 t\u00ednh ch\u1ea5t tia ph\u00e2n gi\u00e1c c\u1ee7a m\u1ed9t g\u00f3c. \u0110\u00ea\u0309 co\u0301 th\u00ea\u0309 v\u01b0\u01a1\u0323t qua n\u00f4\u0303i s\u01a1\u0323 toa\u0301n hi\u0300nh ho\u0323c, ha\u0303y cu\u0300ng v\u01a1\u0301i Vietlearn chinh phu\u0323c ca\u0301c chu\u0309 \u0111\u00ea\u0300 h\u00e2\u0301p d\u00e2\u0303n kha\u0301c \u01a1\u0309 nh\u01b0\u0303ng ba\u0300i vi\u00ea\u0301t ti\u00ea\u0301p theo. Chu\u0301c ca\u0301c ba\u0323n co\u0301 \u0111\u01b0\u01a1\u0323c qua\u0301 tri\u0300nh ho\u0323c t\u00e2\u0323p th\u00e2\u0323t t\u00f4\u0301t.<\/p>\n\n\n\n
<\/p>\n\n\n\n
T\u00ednh ch\u1ea5t ba \u0111\u01b0\u1eddng trung tuy\u1ebfn c\u1ee7a tam gi\u00e1c<\/p>\n\n\n\n
G\u00f3c t\u1ea1o b\u1edfi<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn \u01a0\u0309 chu\u0309 \u0111\u00ea\u0300 l\u00e2\u0300n na\u0300y, Vietlearn se\u0303 cu\u0300ng v\u01a1\u0301i ca\u0301c ba\u0323n \u0111i ti\u0300m hi\u00ea\u0309u v\u00ea\u0300 t\u00ednh ch\u1ea5t tia ph\u00e2n gi\u00e1c c\u1ee7a m\u1ed9t g\u00f3c. \u0110\u00e2y la\u0300 m\u00f4\u0323t trong nh\u01b0\u0303ng ki\u00ea\u0301n th\u01b0\u0301c hi\u0300nh ho\u0323c v\u00f4 cu\u0300ng quan tro\u0323ng cu\u0309a Toa\u0301n hi\u0300nh ho\u0323c l\u01a1\u0301p 7. Tia ph\u00e2n gia\u0301c la\u0300 gi\u0300? Nh\u01b0\u0303ng ti\u0301nh […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[9,4],"tags":[],"class_list":["post-947","post","type-post","status-publish","format-standard","hentry","category-toan-hoc","category-trung-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/947","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=947"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/947\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=947"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=947"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=947"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}