Question

A circle has a diameter of 30 inches. What is the area of the circle?

Answer 1

A≈706.86in²
d Diameter

in
Unit Conversion:
d=30in
Using the formulas
A=πr2
d=2r
Solving forA
A=1
4πd2=1
4·π·302≈706.85835in²

Answer 2

the area of a circle is pi•r^2
the radius is half the diameter so 30/2=15
pi is 3.14
so the area=3.14•(15^2)=706.5in^2