Question

Find the circumference and area of a circle with a diameter of 10 inches. Leave your answers in terms of pi.

Answer 1

Answer:

The answer by Equinimity is incorrect. On my test, those weren't even options. The answer is:

C = 10n; A = 25n

(the symbol that looks like 'n' anyway)

1. It's what the answer is on pretty much every other version of this question on brainly.

2. I did the math.

Answer 2

Hello there!

First, let's take a look at what the formula for the circumference and area of a circle is.

The circumference is "2$\pi$r", or "2 * 3.14 * r".
The area is "$\pi$r^2", or "3.14 * r * r".

Let's establish what the radius is, as $\pi$ is equivalent to 3.14.
The radius is half of the diameter, and our diameter is 10.
Divide 10 by 2 to find our radius.
10 / 2 = 5
The radius is 5.

Now, let's plug in 5 for the radius for both formulas.
C = 2 * 3.14 * 5
10 * 3.14
31.4 is our Circumference.

Now, onto the area.
A = r * r * 3.14
5 * 5 * 3.14
25 * 3.14
78.5 is our Area.

I hope this helps!