"Semi-circle" means half circle; so you just need to calculate the area of the corresponding full circle, and divide the result by 2.
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how do you find the area of a semi circle
to find the area of a semi circle measure the length of the straight edge, divide by 2, square it and multiply by pi. This will give you the area of the circle. To get the area of the semi-circle divide your answer by 2
A semicircle is 1/2 of a circle. Find the area with the diameter you are given as if you had a whole circle, then divide that answer by 2 to get the area of the semicircle.
Calculate the area of a rectangle and of the semicircle separately, then add.
It is the length of the base of the semi-circle.