推 jenshi : 感謝大大的協助，但這是國二段考題，還沒有外心@@" 06/20 15:10
※ 引述《jenshi (小旭)》之銘言：
: http://imgur.com/fPz8mbD
the circumcenter of right triangle is on the midpoint of hypotenuse
and the answer is 52.5
as image
http://imgur.com/iIU0k37
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