To find the area of a circle, we use the formula:
Area = π * r²
In this formula, π (pi) is approximately 3.14, and r is the radius of the circle. The radius is half of the diameter.
Given that the diameter of the circle is 20 inches, we can calculate the radius as follows:
Radius (r) = Diameter / 2 = 20 inches / 2 = 10 inches
Now that we have the radius, we can substitute it into the area formula:
Area = 3.14 * (10 inches)²
Calculating the square of the radius:
(10 inches)² = 100 square inches
Now, substituting that back into the area calculation:
Area = 3.14 * 100 square inches = 314 square inches
Therefore, the area of the circle with a diameter of 20 inches, using 3.14 for pi, is 314 square inches.