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:π是圆周率,等于3.14,r是圆的半径应用实例:圆的半径r是3米,面积S=π×r^2=3.14x3^2=28.26平方米
k'%c| kx8U 1.732/2*l*l/2=3.14/4*de*de
WqY:XE+?\ de=1.732/3.14l=0.55159l=0.743l
<pYGcVB9V https://max.book118.com/html/2017/0328/97441406.shtm
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(2018-05-12 21:26) ]v94U b