# What is the diameter of a circle whose area is #16##pi#?

##### 2 Answers

Dec 25, 2015

#### Answer:

#### Explanation:

Use the formula for the area of a circle:

#A=pir^2#

Here, the area is

#16pi=pir^2#

Divide both sides by

#16=r^2#

Take the square root of both sides:

#sqrt16=sqrt(r^2)#

#4=r#

Since the radius of the circle is

#d=4xx2=8#

Aug 8, 2018

#### Answer:

#### Explanation:

Recall the formula for the area of a circle:

We see that our radius is

Recall that the diameter is twice the length of the radius, so we can multiply this by

Hope this helps!