Question

What is the area of a circle with a diameter that is 20 inches long?

Answer 1

The area of a circle is
A = (pi) * r^2
The area is pi times the radius squared.
You have the diameter; do you know how to get the radius form the diameter?

Answer 2

isn't that half of the other?

Answer 3

Yes, the radius is half of the diameter.
What is the radius?

Answer 4

um.... idk

Answer 5

A=πr2
d=2r
Solving forA
A=1
4πd2=1
4·π·202≈314.15927in²

Answer 6

Was it helpful?

Answer 7

The diameter is 20 inches.
The radius is half of the diameter.
What is the radius?
The radius is half of 20 inches.
What is half of 20 inches?

Answer 8

10 inches

Answer 9

@FROST_ZERO Why do you write the area = 1?
We don't know what the area is. We are trying to find it.

Answer 10

@sws_pvt
Correct. The radius is 10 inches.
Now we can find the area of the circle.
To find the area of a circle multiply the radius by the radius by pi.
For pi you can use the approximation 3.14.

Answer 11

Oh, Sorry

Answer 12

A = 10 * 10 * 3.14

Answer 13

314

Answer 14

Correct.

Answer 15

The answer is 314 square inches.