The half of a circle is called _________

Explanation:
Half of a circle is called semi-circle.
Semicircles are formed when a line passing through the center i.e. diameter touches the ends of the circle at two different points.
The diameter divides the circle into two parts each of them is semi-circle.
The area of semicircle is half of the original circle.
So, option (B) is correct.

Final Answer:
Hence, option (B) is correct i.e. semicircle