Solver Surface Area and Circumference of a Circle
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==section input Find surface area and circumference of a circle: radius *[input r=1] ==section solution perl $A = 3.1415926*$r*$r; print "Surface Area of a circle {{{A=pi*r^2 = pi*$r^2 = $A}}}"; $C = 2*3.1415926*$r; print "Circumference of a circle {{{C=2*pi*r = 2*pi*$r = $C}}}"; ==section output A C ==section check
