Re: [問題] 圍地3
D
E C A
|
|
|
B───O
A→D→E→B圍成四分之三個圓
半徑r=AC=BC=CD=CE
周長:r+r+3πr/2=1
=> r=4/(4+3π)≒0.148978
面積:r*r+3πr*r/4≒0.074489
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※ 編輯: idle0514 來自: 122.121.229.78 (12/20 00:33)
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