3.一直角三角形的两直角边之比为5:12,它的斜边长为5.2cm,则此直角三角形的面积为多少?
人气:108 ℃ 时间:2020-01-31 14:42:04
解答
两直角边5x,12x
25x²+144x²=27.04
x²=0.16
∵x>0
∴x=0.4
5x=2,12x=4.8
直角三角形的面积=½×2×4.8=4.8㎝²
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