Question

What is the area of a circle with a diameter of 16?

Answer 1

The formula to find the area of a circle is: 

$a= \pi r^{2}$

Step 1:
We will be dividing the diameter by two to find the radius. 

16 ÷ 2 = 8

Step 2:
We will find what 8 squared is. 

$8^{2}$ 

8*8= 64


Step 3:
We will be inputting this number is our formula.

$A= \pi 64$


Step 4:
We still need to multiply $64 * \pi$ to find our area.

$64 * \pi$ = 201.0619298297467673

Step 5:

We will round this to the nearest whole number. 

Our rounded number is 201 

Our answer:

$\boxed{a=201}$ or $\boxed{a=201.06}$