The diameter of a circle is 20 cm. Find its area to the nearest whole number.
The formula to find the area of a circle is A = πr^2, where r is the radius of the circle.
Given that the diameter is 20 cm, the radius would be half of the diameter, which is 10 cm.
Plugging in the value of the radius into the formula, we get:
A = π(10)^2
A = 100π
Now, to find the approximate value of the area, we can use the approximation of π to be 3.14:
A ≈ 100 × 3.14
A ≈ 314
Therefore, the area of the circle to the nearest whole number is 314 square cm.