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標題:

Find the number of 'magic' pen

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發問:

A pentagon ABCDE is said to be 'magic' if it has all the following properties. (1) ∠A=60 degree, ∠B=∠C=∠D=∠E (2) BC＜DE＜100 (3) the values of all the lengths are prime Find the number of 'magic' pentagons.

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======================================================== 圖片參考：http://img253.imageshack.us/img253/765/77315250.png 2010-11-01 23:14:48 補充： http://img253.imageshack.us/img253/765/77315250.png

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