Find the area of a circle with a diameter of 40 cm. Use 3.14 for π

and express your answer to the tenths place. Use the formula sheet provided. (1 point)
Responses

1,256 cm2
1,256 cm2

5,024 cm2
5,024 cm2

125.6 cm2
125.6 cm2

62.8 cm2

1 answer

The formula for the area of a circle is A = πr^2, where r is the radius of the circle.

Given that the diameter is 40 cm, the radius (r) is half of that, so r = 20 cm.

Substitute r = 20 cm and π = 3.14 into the formula:

A = 3.14 * (20)^2
A = 3.14 * 400
A = 1256 cm^2

Therefore, the correct answer is 1,256 cm^2.