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pd f Machine

A pdf wr i te r tha t pr oduces qua l i ty PDF f i les wi th ease!

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Kiem tra kien thc cu1)Em hay cho biet quy tch cac iem nhn oan thang AB

cho trc di mot goc la g? ( )0 0

0 180

TL:Quy tch cac iem nhn oan thang AB cho trc dimot goc ( )la hai cung cha goc dng trenday AB

0 0

0 180

2)Em hay cho biet quy tch cac iem nhn oan thang ABcho trc di mot goc la g?090

TL: Quy tch cac iem nhn oan thang AB cho trc di

mot goc la ng tron ng knh AB.090

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T GIAC NOI TIEPTIET 51:

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T GIAC NOI TIEPTIET 51:I/Khai niem t giac noi tiep

T giac noi tiep Khong la t giac noi tiep

Hnh 1 Hnh 2 Hnh 3

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Hnh 43

T giac MNPQ khong la t giacnoi tiep

T giac ABCD lat giac noi tiep

Hnh 44

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MNRS

Ke ten nhng t giac noi tiep ng tron hnh ve.

Cac t giac noi tiep ng tron la:NQRS; MNRS MQRS MNQR

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Hnh 43

T giac MNPQ khong la t giacnoi tiep

T giac ABCD lat giac noi tiep

Hnh 44

Khong the co ng tron nao iqua ca 4 nh M, N, P Q.

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I/Khai niem t giac noi tiep

II/nh l: Chng minh

Ta co: 12

DAB sd DCB

1 DCB sd DAB21

( )2

DAB DCB sd DCB sd DAB

01.360

2

DAB DCB

0180A C Hay

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Bai tap Biet ABCD la t giac noi tiep. Hay ien vao otrong trong bang sau

1) 2) 3) 4)

080

0

060

0

Trng hpGoc

A

0

075 06

01

0105

075

074C

D

0100

10

1 00

115

20

1 0

0180

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Trong cac t giac sau, t giac nao noi tiepc ng tron.

Noi tiep c ng tron.

Khong noi tiep c ng tron.pd f Machine



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T giac co bonT giac co hainh ke nhau

cung nhn canhcha hai nh

con lai dimot goc

nh cach eu

mot iem.iem o chnhla tam ng

tron ngoai tiept giac

T giac co gocngoai tai motnh bang goctrong tai nh

oi cua nho

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2)Cho tam giac ABC nhon, cac

ac biet0

= 90

ng cao BD, CE. Chng minh tgiac BEDC noi tiep ng tron.

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DAU HIEU NHAN BIET T GIAC NOI TIEPNG TRON

1) T giac co tong hai goc oi nhau bang 180 o2) T giac co goc ngoai tai mot nh bang goc trong

tai nh oi cua nh o3) T giac co bon nh cach eu mot iem ta co the

xac nh c4) T giac co hai nh ke nhau cung nhn canh cha

hai nh con lai di mot goc

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Tam cua ng tron ngoai tiep t giac la giao iem cacng trung trc cua hai ng cheo va mot canh cua tgiac.

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Cung co va dan do

1) Ve nha hay tom tac bai hoc theo s o nh hng dn

am cac a ap , , , , ,3) Tiet hoc tiep theo la luyen tap

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