8/2/2019 hinh 9-tiet 51
1/17
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2/17
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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3/17
T GIAC NOI TIEPTIET 51:
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4/17
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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5/17
T GIAC NOI TIEPTIET 51:
Hnh 43
T giac MNPQ khong la t giacnoi tiep
T giac ABCD lat giac noi tiep
Hnh 44
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6/17
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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7/17
T GIAC NOI TIEPTIET 51:
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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8/17
T GIAC NOI TIEPTIET 51:
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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9/17
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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10/17
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11/17
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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12/17
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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13/17
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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14/17
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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15/17
http://www.pdfmachine.com/?cl8/2/2019 hinh 9-tiet 51
16/17
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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17/17
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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