Find the ares of a circle with a diameter of 40 cm. Use 3.14 for pi and express your answer to the tenths place. (1 point)
A. 1,256 cm squared
B. 5, 024 cm squared
C. 125.6 cm squared
D. 62.8 cm squared
C. 125.6 cm squared
To find the area of a circle, you use the formula A = πr^2, where r is the radius of the circle. Since the diameter is 40 cm, the radius is half of the diameter, which is 20 cm.
Plugging in the values:
A = 3.14 * 20^2
A = 3.14 * 400
A = 1,256 cm squared
Therefore, the area of a circle with a diameter of 40 cm is 125.6 cm squared.