Find the area of a circle with a radius of $6.4 \mathrm{ft}$. Use 3.14 as an approximation for $\pi$. Round to the nearest tenth.
A) $12.8 \mathrm{ft}^{2}$
B) $20.1 \mathrm{ft}^{2}$
C) $128.6 \mathrm{ft}^{2}$
D) $514.5 \mathrm{ft}^{2}$

Question

Quizplus · Accepted Answer

The area of a circle is calculated using the formula $A = \pi r^2$. Substituting $r = 6.4$ and $\pi = 3.14$, we get $A = 3.14 \times (6.4)^2 = 3.14 \times 40.96 = 128.6144$. Rounding to the nearest tenth gives $128.6 \mathrm{ft}^{2}$.

Find the Area of a Circle with a Radius Of 6.4