ΌഃʿЧ�ɚ�9.41
ί 1B ̅ୋ 10 �ҢࡁኪཀίՇࡈЧɧԉҖʕ�
(a) ̴ࡁٙ࿁Ꮠԉഃ�
(b) ̴ࡁٙ࿁ᏐᗙϓˢԷ�
Νଣ�
ίՇࡈЧྡҖʕ�
(a) ̴ࡁٙ࿁Ꮠԉഃ�
(b) ̴ࡁٙ࿁ᏐᗙϓˢԷ�
͉ື̥ණʕীሞЧεᗙҖ�
ৰतйൗ̮�͉ືהܸٙ
�ЧྡҖ�ޫމ�Чεᗙ
Җ ��
◀
ίɨྡʕ�̬ᗙҖ ABCD ձ̬ᗙҖ PQRS ݊ЧྡҖ�
B
A5 cm
2 cm
3 cm
6 cm
D
C
Q
P7.5 cm
3 cm
4.5 cm
9 cm
SR
ί˸ɪٙઋرʕ�Ңࡁ͵̙ҪЧྡҖ ABCD ձ PQRS ͜˸ɨҖό
ڌͪ�
ABCD + PQRS
試算
ίྡʕ�ABCD + PQRS�༊ҁϓɨΐᕚ�
(a) +BAD = + �+ABC = + �
+BCD = + �+ADC = +
(b) ()
AB = ()
BC = ()
CD = ()
DA
C
B
A
D
P
S
R
Q
1. +A = +P�+B = +Q�
+C = +R�+D = +S�
у̴ࡁٙ࿁Ꮠԉഃ�
2. PQ
AB = QR
BC = RS
CD = SP
DA = 3
2 �
у̴ࡁٙ࿁ᏐᗙϓˢԷ�
◀
ܲ࿁Ꮠٙᓃනҏᄳ̈
༈࿁ЧྡҖٙΤ၈�˸˙
کʱ፫࿁Ꮠԉձ࿁Ꮠᗙ�