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.
Find the number of 'magic' pen
2010-11-02 5:42 am
回答 (1)
2010-11-02 7:13 am
✔ 最佳答案
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2010-11-01 23:14:48 補充：
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