What is the approximate area of a circle with a diameter of 10 in?
Check the final answer first, then review the worked steps.
Problem
What is the approximate area of a circle with a diameter of 10 in?
Step-by-step solution
The radius is half the diameter, so $r = 10/2 = 5$ in. The area of a circle is $A = \pi r^2$. Using $\pi \approx 3.14$, $A \approx 3.14 \times 5^2 = 3.14 \times 25 = 78.5$ in$^2$.
Answer
$78.5 \text{ in}^2$