Find the area of a circle with a diameter of 40 cm.

A. 1,256 cm squared
B. 125.6 cm squared
C. 62.8 cm squared
D. 5,024 cm squared

1 answer

To find the area of a circle, we use the formula A = πr^2, where r is the radius of the circle.

Given that the diameter (d) of the circle is 40 cm, we can find the radius (r) by dividing the diameter by 2:

r = d/2
r = 40 cm / 2
r = 20 cm

Now we can plug the radius into the formula for the area of a circle:

A = π(20 cm)^2
A = π(400 cm^2)
A = 1256 cm^2

Therefore, the correct answer is:

A. 1,256 cm squared