Picture 1: The diagonal line in the 5 x 13 picture has been blurred (too thick) deliberately, which increases the area mistakenly. This is because the slopes of the triangle (3/8 for A and B) is not equal to the slope of the quadrangle (2/5 for C and D)
Picture 2: the top triangle has a "sunken-in" tangent line, while the bottom one has a bulged tangent line. Same reason for the two triangles, the slope ratio is 2/5 to 3/8.www.ddhw.com
哈哈哈哈 O(∩_∩)O哈哈~ 好久不来了，不小心看了一眼自己主页，发现自动关联了自己以往发过的帖，点进这个看了一眼，笑个半死。。。敢情我当初还发过这么搞笑的东西啊，我自己完全不记得了 
雷达卡
发表于 2008-4-26 11:04:08
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发表于 2008-4-27 04:47:55