Because someone either took it away or its just a trick of the eyes.
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A circle, an ellipse, a closed squiggle with no vertices or crossing points.
Being half of the circumference of a circle, a semi circle has one side
the right side
A circle has only one side and it is called its circumference.
The same as half the side of the square, as the radius of the circle is half its diameter, and the diameter of the circle is equal to the side of the square.