Mathematics
Junior High
Resolved
求解!23&27
*27 下圖吉四邊形ABCD中,AE平分∠BAD,CF平分∠BCD且AE與CF相交於P
點,若∠B=60°,∠D=100°,則∠CPE =
F
D
750
123℃
B
39°
圖甴
度。
QB
A
A
85°
36
C
B
E
D
108
L 100°
G
53°
B.
D
E
P
圖書
圖古
圖(H
91
3-1
內角與外鱼
<23.如右圖(十),△ABC中,R在AB上,且
AR=QR,又QP、BP分別平分∠AQR、
∠ABC,已知∠ARQ=90°,∠P=30°
∠BAC=40°,則∠C=
6
度。
RB
A
R
B
C
P
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