Find the area of a circle with diameter 18. Use 3.14 for pi.
To find the area of a circle, you need to use the formula A = πr^2, where A represents the area and r represents the radius of the circle. The diameter is twice the length of the radius, so in this case, the radius would be 18/2 = 9.
Now we can substitute the value of the radius into the formula:
A = 3.14 * (9^2)
A = 3.14 * 81
A = 254.34
Therefore, the area of the circle with a diameter of 18 is approximately 254.34 square units.