## What is the formula for the area of a half circle?

Area of a Semicircle

In the case of a circle, the formula for area, A, is A = pi * r^2, where r is the circle’s radius.

Since we know that a semicircle is half of a circle, we can simply divide that equation by two to calculate the area of a semicircle.

So, the formula for the area of a semicircle is A = pi * r^2/2.

## What is the area of the semicircle calculator?

How to calculate the area of a semicircle (half circle) –

## How do you find the radius of a semicircle when given the area?

Finding the diameter of a semicircle from its area –

## How do you find the area and perimeter of a semicircle?

Finding the perimeter of a semi-circle –

## What is the formula for circumference?

The circumference = π x the diameter of the circle (Pi multiplied by the diameter of the circle). Simply divide the circumference by π and you will have the length of the diameter. The diameter is just the radius times two, so divide the diameter by two and you will have the radius of the circle!

## How do you find area of a sector?

How To Find The Area Of A Circle’s Sector –

## What is the area of this trapezoid?

Explanation: To find the area of a trapezoid, multiply the sum of the bases (the parallel sides) by the height (the perpendicular distance between the bases), and then divide by 2.

## How do you find the area calculator?

**How to Find Area**

- Square Area Formula. A = a2 A = a × a.
- Rectangle Area Formula. A = l × w. l = length.
- Border Area Formula. A = (l1 × w1) – (l2 × l2)
- Trapezoid Area Formula. A = 1/2(a + b)h.
- Parallelogram Area Formula. A = b × h.
- Triangle Area Formula. s = 1/2(a + b + c)
- Circle Area Formula. A = πr2
- Ellipse Area Formula. A = πab.

## How do I find the length of an arc?

To find arc length, start by dividing the arc’s central angle in degrees by 360. Then, multiply that number by the radius of the circle. Finally, multiply that number by 2 × pi to find the arc length.

## What is the radius of semicircle?

If you are given the length of the semicircle, then C = 2(pi)r, the semicircle length therefore is (pi)r, and the radius is the semicircle length divided by pi. If you are given the distance between the endpoints of the semicircle, well that’s a diameter so the radius is 1/2 of that distance.

## How fo you find the area of a triangle?

Example finding area of triangle –

## What is the radius of a circle?

A radius is a straight line from the center of a circle to the circumference of a circle. If you have two or more of them, they are referred to as radii. All radii in a circle will be the same length. The circumference is the outside perimeter of a circle.