Mathematics
Junior High
求解謝謝：）
m
已知正AABC的外心到三頂點距離和為18, 則正
AAABC 內心到三頂點距離和為多少?
(A) 12 (B) 18
(C) 21 (D) 24
3
12
6:2=2=1
R. 1 3 - 6
= 6
3
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