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.
1,256 cm2
5,024 cm2
125.6 cm2
62.8 cm2
The formula to find the area of a circle is A = πr^2, where r is the radius of the circle. Since the diameter is 40 cm, the radius is half of that, which is 20 cm.
Now, plug in the values into the formula:
A = 3.14 * (20)^2
A = 3.14 * 400
A = 1256 cm^2
Therefore, the area of a circle with a diameter of 40 cm is 1,256 cm^2.
The closest answer is: 1,256 cm^2