The area of a circle with radius $r$ is given by the function $A(r)=\pi r^{2}$. Find the area of the base of a circular storage tank if the radius is 5 feet long. Use $\pi \approx 3.14$.
A) 15.7 square feet
B) 31.4 square feet
C) 78.5 square feet
D) 75 square feet

Question

Quizplus · Accepted Answer

The area of the circle is calculated using the formula $A(r) = \pi r^2$. Substituting $r = 5$ and $\pi \approx 3.14$, we get $A(5) = 3.14 \times 5^2 = 3.14 \times 25 = 78.5$ square feet.

The Area of a Circle with Radius rrr Is Given by the Function

The Area of a Circle with Radius $r$ Is Given by the Function