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[几何] 圆面积

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乌贼 posted 2014-10-5 21:32 |Read mode

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kuing posted 2014-10-5 22:25
都是简单题啊
第一个 $(r-x)^2-x^2=(r/2+x)^2-(r/2-x)^2$
第二个由 $\angle MAD=\angle B=\angle EDA$ 显然成立。

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其妙 posted 2014-10-6 00:11
也来一道关于相切的圆的问题:
1blog png图片.png
妙不可言,不明其妙,不着一字,各释其妙!

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kuing posted 2014-10-6 00:53
回复 3# 其妙

作 AH 出来干啥,影响美观……

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Tesla35 posted 2014-10-6 09:54
回复 3# 其妙

《平面几何中的小花》
T1.jpg
T2.jpg

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其妙 posted 2014-10-7 14:43
回复 5# Tesla35
题库哥!,给醉了!
再来一道:
1blog png图片.png
妙不可言,不明其妙,不着一字,各释其妙!

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