Question

A tsunami warning siren can be heard up to 2.5 miles away in all directions. From how many square miles can the siren be heard?

Answer 1

25 mi^2

Explanation:

2.5^2 = 6.25

6.25 * 4 = 25

Answer 2

19.63 cm

Explanation:

Because it can be heard from all directions, it takes the shape of a circle. Plus, it's 2.5 in all directions, so the lines are all equal. Therefore, 2.5 is the radius. They're asking for the area here, and the formula for area of a circle is A = PI*R^2. I'll use 3.14 to substitute for pi. Exponents first. 2.5^2 = 6.25. After that, we multiply. 3.14*6.25 = 19.625. We arrive at the answer. 19.625 square miles.