Press R to change Radius Press D to change Diameter Press C to change Circumference Press A to change Area If it is lagging too much, push STOP New circle will be drawn to correct size. If circle radius if greater than 180 then it will draw circle with radius of 180. Pi is 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679
