Question

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

d = 13

A = ? sq. units

Answer 1

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Answer 2

The area of a circle is \[\pi r^2\]
The diameter is \[\frac{1}{2}d\]
d = 13, so r = 6.5

\[\pi * (6.5)^2 = ~132.73\]

Answer 3

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

Answer 4

See You guys make it so much easier

Answer 5

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

Answer 6

What if we change it up and the diameter = 12

Answer 7

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.