ΌഃʿЧ�ɚ�9.31
ίྡʕ�PQRS , FGHK�Ӌ x ձ y�
5
R
S P Q
y
38°
42°
G
F
K
H
x
a PQRS , FGHK
` FG = PQ
x = 5
+GFK = +QPS
= y
ί 3FGK ʕ�
+FGK ++FKG + +GFK = 180c �3 ʫԉձ�
42c + 38c + y = 180c
y = 100c
ܓ一
例例 13
解 圖解說明
38°
5
42°
GR
S P Q
F
K
H
x
y
࿁Ꮠᗙഃ�
◀ ࿁Ꮠԉഃ�
◀
ҢࡁኪཀՇࡈΌഃྡҖ࿁Ꮠԉʿᗙʱйഃ�ᜑ್ή�߰Շࡈ
ྡҖՈ௪˸ɪהϞሯ�ۆ̴ࡁΌഃ�್Ͼ�߰ՇࡈྡҖʔՈ௪ɪ
ࠑݔԬሯ�ۆ̴ࡁԨʔΌഃ�˸ɨ࢝ͪəɓԬԷɿ�
Էν� (a) ɨΐ࿁ྡҖʔՈ௪�࿁Ꮠԉഃ�ٙሯ�̴ࡁԨʔΌഃ�
(i) (ii)
80° 85°
130° 125° 133°
135°
100° 104°
95° 93°
E
F I T
Q
P
H R S
G
110° 110°
130° 135°
50° 50°
70° 65°
A P
R
B D Q S
C
+E ၾ PQRST ԉேʔഃ� +A = +P ձ +B = +Q�
Ш +C !+R ձ +D !+S�
ίྡʕ�ABCD , EFGH�Ӌ x�y ձ z�
60°
6 D C
B
A
y
7
H
E
F
G
z x
13
即時訓練即時訓練
➥ ୦ᕚ 9C 5