Question

the diameter of a circle is 4 kilometers. what is the circles area?
round your answer to the nearest hundredth.

Explanation:

Step1: Calculate the radius

Radius $r = \frac{d}{2} = \frac{4}{2} = 2$ km

Step2: Apply area formula

Area $A = \pi r^2 = \pi \times 2^2 = 4\pi$

Step3: Compute and round result

$4\pi \approx 4 \times 3.1416 = 12.5664 \approx 12.57$ square kilometers

Answer:

12.57 square kilometers