已知直角三角形的周长为9cm,斜边长4cm,求这个直角三角形的面积
人气:222 ℃ 时间:2020-04-06 13:35:02
解答
设直角三角形的两条直角边分别为a,b,由题意; a + b = 5; a + b = 16; (a + b ) = a + b+ 2ab = 16 + 2ab = 25; 得ab = 9/2; 面积S = (1/2)*ab = 9/4;
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