Question

What is the area of the larger circle? (Round to the nearest tenth of a foot.)



31.4 ft2
28.3 ft2
12.6 ft2
78.5 ft2

Answer 1

What is the radius of the large circle, then use the area formula.

Answer 2

but how do you do that?

Answer 3

The area of a circle can be found by the formula A=(pi)(radius^2). The radii add up for 5 feat so plug that into the formula and you get A=(pi)(5^2). 5^2 is equal to 25 so now you get A=(pi)(25). Multiply 25 by pi, which is 3.14, and you get your answer which is 78.5.