# The radius of a circle is 6.5. What is the diameter, circumference, and area?

##### 2 Answers

Diameter :

Circumference :

Area :

#### Explanation:

The diameter is 2 times the radius so the diameter of this circle is 13.

The circumference of a circle of radius

The area of a circle of radius

See solution below

#### Explanation:

**Diameter:**

The diameter is always double the length of the radius.

Assuming d represents diameter:

d = 6.5(2)

d = 13

The diameter of the circle measures 13.

**Circumference**

The formula for circumference of a circle is dπ, where d is diameter and π is pi.

Now that we know the length of the diameter, we can find the circumference, or distance around the circle.

Assuming that C represents circumference

C = dπ

C = 13π

C = 13π or 40.84

The circumference measures 13π (exact value) or 40.84 (rounded to the nearest hundredth).

**Area**

The formula for area is A =

A =

A =

A = 42.25π or 132.73

The area is 42.25π

Hopefully you understand some of the characteristics of circles now!