shuxue jj13

gracezhang · 发表于 2011-12-30 02:23:11

为什么是4（2+根号3）R^2?

sdcar2010 · 发表于 2011-12-30 02:39:30

Connect all three centers of the circles and you will have a triangle with equal sides. The height of that triangle (whose side measures 2R) plus 2 R is the length of the shorter side of the rectangle. The longer side of the rectangle is 4 R.

gracezhang · 发表于 2011-12-30 05:49:24

thanks very helpful

shuxue jj13

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