9.50 ୋ 9
15. ίྡʕ�ABCDE + PQRST�߰ AB = 18 cm�AE = 24 cm�
BC = 30 cm�PQ = (x - 5) cm�PT = x cm ձ
QR = (x + y) cm�Ӌ x ձ y ٙ࠽�
16. A ձ B ݊ɓ࿁Ч̬ᗙҖ�̬ᗙҖ A ̬ٙૢᗙٙڗܓʱй
݊ 2 cm�3 cm�5 cm ձ 6 cm�Ͼ̬ᗙҖ B ٙ௰ᗙٙڗܓ
݊ 4 cm�Ӌ̬ᗙҖ B ٙմޢ�
17. ਞڝྡ�кᓙ ABCD + EFGH ݊щ͍ᆽ�
18. ίྡʕ�PQRS ձ ABCD ே݊ڗ˙Җ�кᓙ༈Շࡈڗ˙Җ݊
щЧ�
ܓ三
19. P ձ Q ݊ɓ࿁Ч̬ᗙҖ�̬ᗙҖ P ̬ٙૢᗙٙڗܓʱй݊
x cm�7 cm�y cm ձ 15 cm�Ͼ̬ᗙҖ Q ٙ௰ڗᗙٙڗܓ݊
7.5 cm�ʊٝ x ݊ɓࡈʃ 7 ٙᅰ�Ͼ y ݊ɓࡈɽ 7 Шʃ
15 ٙᅰ�̬߰ᗙҖ Q ٙմޢ݊21 cm�Ӌ x ձ y ٙהϞ̙ঐ
࠽�
20. ତϞ 100 ੵɽʃΝ͍ٙ˙Җॷ̔�ɿϓ͜Չʕ 4 ੵܳϓ̛˙
ٙྡҖ�ߕҎૐл͜வԬ͍˙Җॷ̔ܳ̈ၾ̛˙ྡҖҖً
Ν˲༰ɽٙྡҖ�ߕ௰ˇცࠅεˇੵ͍˙Җॷ̔�
A E
T
S
R
Q
P
B
C
D
18 cm
24 cm
30 cm
(x + y) cm
(x - 5) cm
x cm
A
E H
D
B C F G
60°
6 cm
4 cm
3 cm
7 cm
➥ Է 18
A
B C
S
P
R
Q
D
3 cm
3 cm
20 cm
3 cm 12 cm
3 cm