book Maths Puzzle Numerical Ability

A circle has a circumference of 20(pi)meters. Sorry There is no key stroke for pi. Find the radius of the circle. Thanks.

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book Other Question

i=sqrt(p/r) if p=500 ,r=25. would that make the answer 20 ? One of two supplementary angles is 4degrees more than 1/3 of the other angle. Find the measure of each of the angles.