Question

Find the exact circumference of a circle with the given radius.

Answer 1

Answer:

Hello!

To find the circumference of a circle you use the equation

C = 2 \pi rC=2πr

C is circumference

r is radius

Put in the values we know

C = 2 *\pi *3 \frac{1}{4}C=2∗π∗341

Multiply the 2 and the 3 1/4

C = 6.5 \piC=6.5π

The answer is C = 6.5

Answer 2

Answer:

$6.5\pi in$ (B)

Step-by-step explanation:

The circumference of a circle is the length of its perimeter, and it is given by the equation

$p=2\pi r$

where

r is the radius of the circle

In this problem, the radius of the circle is

$r=3\frac{1}{4}in$

Which is equivalent to

$r=\frac{3\cdot 4 +1}{4}=\frac{13}{4}=3.25 in$

Therefore, substituting into the equation, we find the circumference of the circle:

$p=2\pi r=2\pi (3.25)=6.5\pi in$

So, option B.