The area of a circle

Formula for finding the area of a circle through the radius:

S = π ⋅ r ²

Where π is a constant equal to (3.14); r is the radius of the circle.

Formula for finding the area of a circle through the diameter:

S = π ⋅ d² / 4

Where π is a constant equal to (3.14); d is the diameter.

Formula for finding the area of a circle through the length of the circle:

S = l² / (4 ⋅ π)

Where π is a constant equal to (3.14); l is the length of the circle.