The area of a pizza is 1386 centimeters. What is the radius?

Assuming that this is a circular pizza : P

The area of a circle is:

A=πr^2 divide both sides by π

A/π=r^2 take the square root of both sides

r=√ (A/π), we are told that A=1386 so:

r=√ (1386/π) cm

r≈21 cm (to nearest hundredth of a centimeter)