What is the area formula for a half-circle?
Determine the area formula for a half-circle.
A circle is a shape consisting of points in a plane such that each point is equidistant from a fixed point (the center).
A half-circle is also known as a semicircle which is a one-dimensional locus of points that forms half of a circle.
Since the area of a circle is .
So, the area of a semicircle or half-circle is , where is the radius.
Hence, the area formula for a half-circle is .