An equilateral triangle xyz as it's vertices on a circle. If |xy|=20cm, |yz|=20cm and |xy|=20cm, calculate the radius of the circle

Answer 1

for a triangle of side a, the radius r is
r = a/√3

recall that the circumcenter will be at the intersection of the medians, which are 2/3 of the way from vertex to opposite side.