What is the circumference of a circle that ha a diameter of 60cm?

The equation is 2 (pi) R and the radius is 30 because it's 1/2 the diameter and 30 x (pi) is 92.2 (x2) is 188.4

The circumference is 188.4cm

So the equation of the circumference is 2 (pi) times r and diamater is 2 times of radius so 60/2=30

put it into the equation

2 (pi) r=

(just for fun, you could have just put in pi times 60 since 60/2 times 2=60)

pi times 60=3/14159 ... times 60 or = 188.496 cm is the circumference

the area formula is pi times r^2 and the circumference formula is 2pi time r