Question

what is the area in cm square of the circle shown above? round your answer to the nearest tenth.

Answer 1

Using the formula for the area of a circle

$A=\pi r^2$

Where r is the radius of the circumference.

But, the problem gives us the diameter, to find the radius just divide the diameter by 2, then r = d/2 = 20/2 = 10cm, apply it to the formula

$\begin{gathered} A=\pi(10)^2 \\ \\ A=100\pi \\ \\ A\approx314.2\text{ cm}^2 \end{gathered}$Final answer

The area of the circle is 314.2 cm²