To recall, a ar is a portion of a circle enclosed between its 2 radii and the arc adjoining them.

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For example, a pizza slice is an example of a ar representing a fraction of the pizza. There are two types of sectors, young and significant sector. A minor sector is much less than a semi-circle sector, conversely, a major sector is a sector the is better than a semi-circle.

In this article, you will certainly learn:

What the area that a sector is.How to uncover the area of a sector; andThe formula because that the area that a sector.


What is the Area the a Sector?

The area of a ar is the an ar enclosed through the two radii the a circle and also the arc. In basic words, the area that a ar is a fraction of the area of the circle.



Area the a sector = (θ/360) πr2

= (130/360) x 3.14 x 28 x 28

= 888.97 cm2

Example 2

Calculate the area of a sector v a radius the 10 yards and an angle of 90 degrees.


Area of a sector = (θ/360) πr2

A = (90/360) x 3.14 x 10 x 10

= 78.5 sq. Yards.

Example 3

Find the radius the a semi-circle through an area that 24 inch squared.


A semi-circle is the exact same as half a circle; therefore, the angle θ = 180 degrees.

A= (θ/360) πr2

24 = (180/360) x 3.14 x r2

24 = 1.57r2

Divide both sides by 1.57.

15.287 = r2

Find the square root of both sides.

r = 3.91

So, the radius that the semi-circle is 3.91 inches.

Example 4

Find the main angle that a sector who radius is 56 cm and also the area is 144 cm2.


A= (θ/360) πr2

144 = (θ/360) x 3.14 x 56 x 56.

144 = 27.353 θ

Divide both sides by θ.

θ = 5.26

Thus, the central angle is 5.26 degrees.

Example 5

Find the area of a sector with a radius of 8 m and a central angle that 0.52 radians.


Here, the central angle is in radians, so us have,

Area that a ar = (θr2)/2

= (0.52 x 82)/2

= 16.64 m2

Example 6

The area the a sector is 625mm2. If the sector’s radius is 18 mm, find the central angle that the ar in radians.


Area of a ar = (θr2)/2

625 = 18 x 18 x θ/2

625 = 162 θ

Divide both sides by 162.

θ = 3.86 radians.

Example 7

Find the radius the a sector whose area is 47 meter squared and central angle is 0.63 radians.


Area the a ar = (θr2)/2

47 = 0.63r2/2

Multiply both political parties by 2.

94 = 0.63 r2

Divide both political parties by 0.63.

r2 =149.2

r = 12.22

So, the radius of the ar is 12.22 meters.

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Example 8

The length of an arc is 64 cm. Uncover the area of the sector created by the arc if the circle’s radius is 13 cm.