Solver DESCRIBE a circle by radius
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==section input Describe a circle with radius *[input r=2]. ==section solution perl $pi = 3.1415926; $d = $r*2; my $area = $r*$r*$pi; my $perimeter = $d*$pi; print " Description of circle with radius $r: Diameter: {{{d = 2r = 2*$r = $d}}}. Area: {{{area = pi\\r^2 = pi*$r^2 = $area}}} Perimeter: {{{perimeter = 2\\pi\\r = 2\\pi*$r = $perimeter}}} {{{drawing( 300, 300, -1, 10, -1, 10, grid( 1 ), red( circle( 5, 5, $r ) ), circle( 5, 5, 0.1 ) ) }}} "; ==section output d ==section check r=2 d=4
