Question

A circle has a diameter of ten yards. What is its area? Use three point one four for pi

thirty-one point four square yards

thirty-nine point two five square yards

sixty-two point eight square yards

seventy-eight point five square yards

Answer 1

\[A = \pi r^2 \]
r = d/2
r = 5
\[A = \pi 5^2\]
\[A = 25 \pi\]
A = 78.5
Answer is D.