Rebecca decides that this building will be too small at a scale of 1 cm = 3 m. She changes the plan to be at a 1 cm = 4 m scale. What will be the area of the circular pool when it is constructed at this scale?

A. 78.5m^2

Step-by-step explanation:

To find the area of a circle you have to do:

Area = πr^2

The diameter is 2.5 x 4 which equals 10 and radius is half the diameter, so 5. Now your equation would be:

Area = π5^2

Solve:

π x 5^2

5^2 = 5 x 5 = 25

π x 25

π ≈ 3.14

3.14 x 25 = 78.5

π5^2 ≈ 78.5

78.5m^2