周长表示为C,面积表示为S
C正:C圆 = (4*1) : (π * 1) = 4 : π = 4 : 3.14 = 200 : 157
S正:S圆 = (1^2) :(π*0.5*0.5) = 1:0.25π = 4:π = 4:3.14 = 200:157
周长表示为C,面积表示为S
C正:C圆 = (4*1) : (π * 1) = 4 : π = 4 : 3.14 = 200 : 157
S正:S圆 = (1^2) :(π*0.5*0.5) = 1:0.25π = 4:π = 4:3.14 = 200:157