Half of a circle, with endpoints at opposite ends of a diameter. For radius , the upper semicircle in the complex plane is parametrized by , , going counterclockwise from to .
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A semicircle is a shape that represents half of a circle. It is formed by cutting a circle along a diameter. The key characteristics of a semicircle are: 1. **Definition**: A semicircle consists of the arc of a circle that spans 180 degrees and its endpoints, which are the endpoints of the diameter. 2. **Diameter**: The line segment joining the endpoints of the arc is called the diameter of the semicircle.