The area of a semi circle is the total space inside the semi circle.
If radius of the circle = r
Then, Area of the circle = (1/2)xπr2 sqare units
Here, π=22/7=3.14 aproximately
Ex:-
radius of the circle = r = 14cm
Area of the semi circle = (1/2)xπr2
= 1/2(22/7)x14x14
=11x2x14
=308 cm2