which equation can be used to find the area of a circle with a diameter of 12. use 3.14 for pie.
area of a circle = π * radius2
radius = 1/2 * diameter
radius = 1/2 * 12
radius = 6
area of this circle = π * 62
area of this circle = 36π
area of this circle ≈ 36(3.14) = 113.04 square units
