8.66 ୋ 8
41. A ᓃٙѬᅺ݊ (-2 , 7)�A Σ̛̻4 ఊЗЇ B ᓃ�B ض x ൿˀ
࢛Ї C ᓃ�D ݊ B ᔎࡡᓃ O ૅᔷ 180c ה�
(a) Ӌ B�C ձ D ٙѬᅺ�
(b) ABCD ݊ࡳ၇̬ᗙҖ�
(c) Ӌ ABCD ٙմޢ�
42. P ᓃᔎࡡᓃ O Աࣛ০˙Σૅᔷ90cЇ Q ᓃ�Q ض y ൿˀ࢛Ї
R ᓃ�R ᔎࡡᓃ O Աࣛ০˙Σૅᔷ 90cЇᓃ S(-4 , -6)�
(a) Ӌ P�Q ձ R ٙѬᅺ�
(b) PQRS ݊ࡳ၇̬ᗙҖ�
(c) Ӌ PQRS ٙࠦጐ�
༨ሙၝΥᕚ
43. ڝྡהͪމɧԉҖ ABC�BC ஷཀࡡᓃ O�AC ၾ y ൿʹ
D ᓃ�
(a) Ӌ 3ABC ٙࠦጐ�
(b) ߰Җ ABOD ٙࠦጐ݊ 3ABC ٙ 75%�Ӌ D ٙѬᅺ�
44. P(12 , 5) ཀՇϣ̻Ց༺ R ᓃ�߰ R ٙ x Ѭᅺձ y Ѭᅺʱй
ˢ P ٙɽ 25% ձ 40%�༊ࠑ༈̻ᜊ౬̙ٙঐઋر�
45. ̛ྡʕ�A ݊ٙː�B ݊ɪٙɓᓃ�
(a) Ӌٙ̒ࢰ�
(b) Ӌٙࠦጐ�
�՟ r = 3.14��
46. ίྡʕ�ٙː G З x ൿɪ�༈ஷཀࡡᓃ�Չմ݊
18.84 ఊЗ�
(a) Ӌٙ̒ࢰ�
�՟ r = 3.14��
(b) Ӌ G ٙѬᅺ�
A(-4,6)
C(4,2)
D
B(-4,-2)
y
x
O
A(4,2)
B(-1,2) y
x
O G
y
x
O
5
5
5
5
5
5
נφʈЪॷ 8
[༆ᕚࠅᓃ�ୋ 42 ᕚ
(a) ண P ٙѬᅺ݊ (a , b)�˸ a
ձ b ڌͪ Q�R ձ S ٙѬᅺ�
͟ʊٝ S ٙѬᅺ�ΪϤ̙
Ӌ a ձ b ٙ࠽�͟Ϥ�̙
Ӌ P�Q ձ R ٙѬᅺ�
(b) Ꮸ᜕ PQRS ᗙ݊щ˥̻ᇞ
אདۧᇞ�͟Ϥ�кᓙ PQRS
݊ࡳ၇̬ᗙҖ�]
༨ሙᕚʈЪॷ S1
[༆ᕚࠅᓃ�ୋ 41(b) ᕚ
Ꮸ᜕ ABCD ᗙ݊щ˥̻ᇞא
དۧᇞ�͟Ϥ�кᓙ ABCD ݊
ࡳ၇̬ᗙҖ�]
B(2 , 7)�C(2 , -7)�D(-2 , -7)
P(4 , -6)�Q(6 , 4)�R(-6 , 4)
32 ̻˙ఊЗ
(0 , 4)
P Σ̛̻ 3 ఊЗܝ�ΎΣɪ̻ 2 ఊЗЇ R�
�אՉ˼Υଣഈࣩ�
5 ఊЗ
78.5 ̻˙ఊЗ
3 ఊЗ
(-3 , 0)
36 ఊЗ
100 ̻˙ఊЗ
ڗ˙Җ
Җ