How to find area and perimeter of a half circle?

The area of a circle is equal to πr². So, to find the area of a half circle, you need to use πr² for the radius of the circle. The perimeter of a half circle is just 2πr or the circumference of the circle. So, the area of a half circle is equal to πr² while the perimeter of half circle is equal to 2πr. So, the area of a half circle is the same as its perimeter squared

How to find area of a semi-circle?

To find the area of a half circle, you need to know the radius. Radius is the distance from the center of a circle to any point on the circumference. With a semicircle the radius is just the length of one of the sides. That means the area of a semicircle is equal to the area of a circle with the same diameter whose center is at the center of the semicircle.

How to find perimeter of a semi-circle?

If you have already drawn a line that connects the two points of the semicircle, then the perimeter of the semicircle is the length of that line. If you have drawn the semicircle using the compass, then measure the diameter of the semicircle, subtract the diameter from half the circumference, and the result will be the perimeter.

How to find area of a half circle with radius?

Finding the area of a half circle with radius is quite simple. The area of a half circle with radius r is equal to Pi times the square of the radius, which is Pir2. As you can see, you will need to know the radius of the circle to find the area. A half circle with radius of 3 has an area of 9 Pi.

How to find area of a semi-circle with radius?

Use the Pythagorean theorem to find the area of a half-circle with a given radius. This method is easy to use and works for any radius, although the results are expressed in the unit of square root of a square. Therefore, you will need to use a calculator to convert the values if you want to use this method to find the area of a circle with a given radius.