来自吕辉的问题
一个三角形三个内角的度数比是3:2:1.如果它的三条边共长60厘米,这个三角形的面积是多少
一个三角形三个内角的度数比是3:2:1.如果它的三条边共长60厘米,这个三角形的面积是多少
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2020-03-24 10:26
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刘彦文
三内角分别是180x3/6=90180x2/6=60180x1/6=30
则三边之比:0,866:1:0,5
计算出斜边=25,36短直角边=12,68长直角边=21,96
这个三角形的面积=12,68x21,96/2=139,2264（平方厘米）
2020-03-24 10:30:29
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