Find the area of the circle with the given radius or diameter. Use sqrt = 3.14.

d = 13

A = ? sq. units

Question

Find the area of the circle with the given radius or diameter. Use sqrt = 3.14.

d = 13

A = ? sq. units

anonymous · Answer

??????

stormfire1 · Answer

The area of a circle is $$\pi r^2$$
The diameter is $$\frac{1}{2}d$$
d = 13, so r = 6.5

$$\pi * (6.5)^2 = ~132.73$$

stormfire1 · Answer

Actually, if you're only using 3.14, the final answer would be 132.665

anonymous · Answer

See You guys make it so much easier

stormfire1 · Answer

Oh, and I meant to say the *radius* is 1/2d...not awake yet

anonymous · Answer

What if we change it up and the diameter = 12

stormfire1 · Answer

Then instead of squaring 6.5 (whic is 1/2 of 13), you'd square 6 (which is 1/2 of 12).

Just remember that the radius is 1/2 of the diameter and you'll be able to solve these whether you're given a radius or a diameter in the problem.