Find the area of a circle with a diameter of 40cm. Use 3.14 for pi and express your answer to the tenths place.
First, we need to find the radius of the circle. The radius is half the diameter, so the radius would be 40cm / 2 = 20cm.
Next, we use the formula for the area of a circle, which is A = πr^2, where π is 3.14 and r is the radius.
Plugging in the values, we get:
A = 3.14 * (20cm)^2
A = 3.14 * 400cm^2
A = 1256 cm^2
Therefore, the area of the circle with a diameter of 40cm is approximately 1256 square centimeters.