ΌഃʿЧ�ɚ�9.49
ܓ二
Ӌɨΐ࿁ЧྡҖʕٙ͊ٝඎ�[ୋ 9-10 ᕚ]
9. ABCD + HGFE 10. ABCD + EFGH
9 cm
15 cm 6 cm
80°
HB
x
y
A
C
D
E
G F
42° 20°
16 cm
12 cm
18 cm
B C F G
z
x
y
A
M D
H
N
E
CMD 和 GNH 都是直線。
11. ίྡʕ�ABCF + FEDC�BCD ݊ɓૢٜᇞ�
(a) Ӌ +CDE�
(b) Ӌ CF�
12. ίྡʕ�AEFD + EBCF�AEB ձ DFC ேٜ݊ᇞ�
(a) Ӌ AD�
(b) Ӌ AE : AB�
13. ʊٝ ABCD ձ PQRS ே̬݊ᗙҖ�˲ ABCD + PQRS�
+A = 70c�AB = 6 cm�BC = 2QR ձ AB # DC�
(a) Ӌ+D� (b) Ӌ+S� (c) Ӌ PQ�
14. ίྡʕ�WXYZ + MQPN�߰ WZ = 12 cm�YZ = 18 cm�
MN = a cm ձ PN = (a + 3) cm�Ӌ a ٙ࠽�
9 cm
6 cm
4 cm
125°
B
C
D
A F E
18 cm
12 cm
B C
F
E A D
W Z
12 cm
18 cm
(a + 3) cm a cm
X Y
P N
Q M