What is the radius of a circle with a circumference 36 meters?

Answer 1

Circumference of a circle = pi * d

d = 2r (i.e. the radius * 2)

Therefore the radius = (Circumference/pi) / 2

I will substitute pi = 3.14 (Note: this is only a loose approximation. Pi is an irrational number which is infinitely long. If you wish a more precise answer you should recalculate with a more accurate approximation of pi.)

radius (in metres) = (36/3.14) / 2 = 5.732m (to 3 decimal places only; it is important that you understand that this answer is only an approximation and why this is so).