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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
Z[#8F&QV!m 1.732/2*l*l/2=3.14/4*de*de
2P"643tz de=1.732/3.14l=0.55159l=0.743l
Z>g72I%X https://max.book118.com/html/2017/0328/97441406.shtm
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N http://www.doc88.com/p-9959653916329.html
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(2018-05-12 21:26) L1SX2F8