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

Question

Use π=22/7

Answer 1

A=(pi)*r^2

1386=(22/7)(r^2)

multiply both sides by (7/22)

(7/22)(1386)=(7/22)(22/7)(r^2)

7*63=r^2

7*7*3*3=r^2  (7*63=441 which is 21*21)

(21)^2=r^2

r=21 cm