6. 如右圖,AB、CD 為圓上兩弦,且交於
圓內一點P,若AP = 8,BP = 12,CP
= 6,則DP = A $16
q
6:8=
OPM
7. 如右圖,△ABC中,∠BAC = 90°
ADLBC'#AC = 4√3 BD = 2 · EU:
(1) AD= 4520 2√3
2:42
(2)△ABD 面積:△CAD 面積 =
AB:AC = BD : ADDIN
C
A
B
8
D
2+3=6:
453
16
3
42
48
B
C
² PD 48-X²
1:8
0 113
201
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