Area of a semicircle = (pi*radius^2)/2
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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.
You use the equation Area = width x length. And solve for the width. You solve it by dividing both sides by the length to get.. Area/length = width
50.25cm
solve it
You don't have enough information. But if you have the base and the area, you can solve the equation for the area of the triangle for the height.