一个直角三角形.斜边是30米.高是3米.求底边长度,和底边和斜边的夹角度数.
一个直角三角形.斜边是30米.高是3米.求底边长度,和底边和斜边的夹角度数.
数学人气:366 ℃时间:2020-04-06 16:02:33
优质解答
30^2=3^2+底边长的平方 底边的平方=900-9 底边=9倍根号11 设底边与斜边夹角为α,则tanα=对边/邻边=高/底边=3/9倍根号11 然后查表用反三角函数求α. α=arctan29.85
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