Area and Perimeter of a Sector (Part of a Circle)

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The area of a circle isand the perimeter or circumference isA sector is a fraction of a circle.

To find the area of a sector, we just find that fraction of the area of a circle.

The sector to the right is a fractionof the circle to the left so the the area of the sector is 

The curved part of the sector isof the circumference of the circle but to find the perimeter of the sector we must add(the radius of the circle is) so the perimeter of the sector is

Ifandthe area of the sector isand the perimeter is 

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