Question

Find the area of the circle. Use 3.14 for the value of pi. I need to find the radius before finding the area

Answer 1

Solution

Given the circle as shown below,

diameter = 10.2

$\begin{gathered} \text{radius }=\text{ diameter/2} \\ r=\frac{d}{2}=\frac{10.2}{2}=5.1in \end{gathered}$

Area of a circle = πr²

where π = 3.14

$\begin{gathered} A=\pi r^2 \\ A=3.14(5.1)^2 \\ A=3.14(26.01) \\ A=81.67in^2 \end{gathered}$

Therefore the area of the circle = 81.67in²