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 Description  
 Semicircle:  Half of a circle.

Note: A line containing the diameter of a circle separates the circle into two semicircles.

 

 

In the figure, the line EF, which contains the diameter of circle A, divides the circle into two semi-circles, arc EGF and arc EHF.

The degree measure of a semi-circle is 180 degrees, half that of a full circle.