area:
\(764.15 \; \mathrm{yd}^2\)Circles (working backward)
Find the radius of a circle given the circle's area
Find the radius of each circle using 3.14 as pi. Round your answer to the nearest tenths place when necessary. Do not round throughout the problem.
Know the formulas for the area and circumference of a circle and use them to solve problems; give an informal derivation of the relationship between the circumference and area of a circle.