In the figure above, the radius has a length of 5, and the measure of the central angle is 72 degrees. The arc length is of
the circumference:
- Area of a Circle
Area of a Circle = πr^2The area of the circle is π(4)^2 = 16π.
- Area of a Sector
A sector is a piece of the area of a circle. If n is the degree measure of the sector’s central angle, then the formula is this: