ٜԉѬᅺӻ�ɓ�8.49
(b) C ٙѬᅺ݊ (5 , -4)�
a B ձ C ٙѬᅺʔΝ�
` C ၾ B ӚϞࠠΥ�
` ʔΝจ༈܁၈�
圖解說明
y
x
O
A(-5,-4) C
�C ၾ B ӚϞࠠΥ�ٙ
จܠ݊�C ձ B ݊ʔ
Νٙᓃ��
◀
ίྡʕ�Q(-2 , -2) ݊͟ P ᓃᔎࡡᓃ O Ա
නࣛ০˙Σૅᔷ 90c ה�
(a) Ӌ P ٙѬᅺ�
(b) P ض y ൿˀ࢛Ї R ᓃ� ᆀ܁၈ R
ၾ Q ࠠΥ�Ы݊щΝจ�༊༆ᙑЫٙ
ഈࣩ� 18
即時訓練即時訓練
➥ ୦ᕚ 8D 24
O
x
y
Q(- 2,- 2)
˸ɨԷɿ࢝ͪɓࡈɧԉҖٙᓃΝٙૅᔷܝ�̙̈ɓࡈ
อٙɧԉҖ� ྡʕהͪމٜԉɧԉҖ JKL�̴ٙᓃ݊ J(-2 , 3)�
K(-3 , 1) ձ L(-2 , 1)�J�K ձ L ʱйᔎࡡᓃ O Աනࣛ
০˙Σૅᔷ 90cЇ Jl�Klձ Ll�
(a) Ӌ Jl�Klձ Ll ٙѬᅺ�
(b) ίྡʕᖭ 3JlKlLl�JlLl ݊щٜۧ KlLl�
༊༆ᙑЫٙഈࣩ�
(a) Jl ٙѬᅺ = (,)32
Kl ٙѬᅺ = (,)13
Ll ٙѬᅺ = (,)12
(b)
O
-3
x
y
J
K
K'
J'
L'
L
-2 -1 1
1
2
3
2 3 4
a JlLl݊˥̻ᇞ�Ͼ KlLl݊དۧᇞ�
` JlLlٜۧ KlLl�
ܓ二
例例
解釋題 19
O
-3
x
y
J
K L
-2 -1 1
1
2
3
2 3 4
解
[ᕚۨ�ऒʿٜԉѬᅺ̻ࠦɪૅᔷᜊ౬ٙᕚͦ�]
̂Էᕚ 19
[Ԉ T8.76h ࠫ]
(2 , -2)
݊