Question

What is the circumference of a circular amphitheater with a diameter of 33 meters

Answer 1

The equation for circumference is
$c = 2r\pi$
Since you have the diameter you can either divide the diameter (d) by two to get the radius (r), or you can divide two from the equation to give you
$c = d \pi$
So the circumference is 33*pi meters, approximately 103.62 meters

Answer 2

The circumstance is 33*pi meters. So it’s about 103.62 meters