[計量] 請教兩題韓國JJ
十月九日韓網上的JJ #10748
http://www.gohackers.com/html/?id=greaftertest
7. As shown in the figure above, there are two squares one in the other with
inner square side length 4 and outer square side length 12. Find the area of
any one of the trapeziums?
Sol) 2
┌──────┐
│\ /│
│ ┌──┐ a│
│ │ 4│ r│12
│ │ │ e│
│ └──┘ a│
│/ \│
└──────┘
有點看不懂他的解法
梯形的高是 (12-4)* 1/2 = 4 我懂
所以面積不是應該是 (4+12)*4* 1/2 =32嗎??
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