P is roughly equal to 314. See Area of a circle. As the perimeter of a circle is 2pr or pd.
The 1 2 1 2 and 2 2 cancel each other out so you can simplify to get this perimeter of a semicircle formula.
The 1 2 1 2 and 2 2 cancel each other out so you can simplify to get this perimeter of a semicircle formula. The perimeter of a semicircle is the sum of the half of the circumference of the circle and diameter. Therefore the area of a semi-circle will be. The formula is x h 2 y k 2 r 2.