Remember that the perimeter is the distance round the outside.
A semicircle has two edges. One is half of a circumference and the other is a diameter.
Remember this is the circumference of the whole circle, so now we need to half this answer.
For any circle with radius, r, the area, A, is found using the formula:
A semicircle is just half of a circle. To find the area of a semicircle we calculate the area of the whole circle and then half the answer.
Area of semicircle
This shape is made up of a rectangle and a semicircle.
To find the total area we just find the area of each part and add them together.
Area of the rectangle = length x breadth