A semicircle is a two-dimensional geometric shape that consists of a curved arc and a straight line segment that connects the two endpoints of the arc. Here are the steps to identify a semicircle:
Look for a curved arc that forms a half-circle shape.
Locate the center point of the arc, which is also the midpoint of the line segment connecting the two endpoints.
Check that the line segment connecting the endpoints is a diameter of the circle.
Confirm that the arc and line segment together form a continuous, closed shape that divides the circle into two equal halves.
Finally, compare the shape to a circle to make sure that it is only half of a complete circle.
If all of these conditions are met, then the shape is a semicircle.