## What is the formula for area of a sector?

so the formula is “area of the sector divided by total area of the circle equals degrees of the central angle divided by total degrees in a circle” ?

## What is the area of a sector?

The area of a sector of a circle is ½ r² ∅, where r is the radius and ∅ the angle in radians subtended by the arc at the centre of the circle. So in the below diagram, the shaded area is equal to ½ r² ∅ .

## How do you find an area of an arc?

Calculating Areas of Sectors and Segments: Examples (Basic

## How do you work out the area of a sector without the angle?

Sector Area. How To Work Out The Area Of A Sector When The

## 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!

## What is the formula for arc length of a sector?

A central angle which is subtended by a major arc has a measure larger than 180°. The arc length formula is used to find the length of an arc of a circle; l=rθ l = r θ , where θ is in radians. Sector area is found A=12θr2 A = 1 2 θ r 2 , where θ is in radians.

## What is the area of semicircle?

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.

## How do you find the area of 3/4 of a circle?

The area of a circle is equal to Pi π times the radius r squared. Substitute in the value of the radius r=34 r = 3 4 into the formula for the area of a circle. Pi π is approximately equal to 3.14 .

## What is the formula of an arc?

Remember that the formula for arc measure is: s / r, or 4 / 5. Now, let’s convert 4 / 5 radians to degrees by multiplying by 180 / pi. (4 / 5)(180 / pi) = 45.837, or approximately 46 degrees. As 46 degrees is about 1/8 of 360 degrees, the arc should be about 1/8 of a circle, as shown in our example.