Group 5

The Formula for the area of sector The Length of an arc is proportional to the angle

subtended at the centre of the circle

Similarly, the area of a sector is also proportional to the angle subtended at the centre of the circle

The area of a sector of a circle can be calculate by using this formulae

Find The Area Of a Sector given the radius and angle at the centre

A

O B7 cm

Formulae

Solution

Find The Angle Of The Centre. Given the radius and area of sector

A

O

B

Find The Radius. Given The Area Of A Sector And The Angle Of The Centre

A

O

B

Solve The Problem Find The Area Of Sector

A

O

B

In the diagram, O is the centreof the circle. Find the area of Major Sector AOB.

Answer

Find The Area Of Circle

O 14cm

In the diagram, O is the centreof the circle. Find the Area Of Circle.With the radius 28cm

Answer

Circles Formula

Area Of Sector CircleArea Of Circle

Circumference of Circle Length Of Arc