http://mathworld.wolfram.com/EquilateralTriangle.html
altitude h = DE sin 60 = sqrt(3)/2 * DE
http://mathworld.wolfram.com/EquilateralTriangle.html
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謝謝任教授沒笑話我...上幾年班以後把這些知識都全部還給老師了,汗顏!
-陶陶樂,樂陶陶-
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12/14/2009 postreply
16:35:51
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Why didn't thank me?!!!
-念親-
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(208 bytes)
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12/14/2009 postreply
18:53:13
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回複:Why didn't thank me?!!!
-陶陶樂,樂陶陶-
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(93 bytes)
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12/14/2009 postreply
21:34:40
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回複:回複:Why didn't thank me?!!!
-陶陶樂,樂陶陶-
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12/14/2009 postreply
22:11:19