Section 11-5 Areas of Circles and Sectors. Area of a Circle The area of a circle is times the square of the radius. Formula:

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Presentation transcript:

Section 11-5 Areas of Circles and Sectors

Area of a Circle The area of a circle is times the square of the radius. Formula:

Sector of a circle A region bounded by two radii of the circle and their intercepted arc. A B O C Sector AOB *The unshaded region is also a sector!

Slices of Pizza are Sectors!

To find the area of a sector: 1.Find the Area of the Circle 2.Find the ratio of the measure of the arc to the whole circle. 3.Find the product of the ratio and Area.

In General: Area of a sector =

Example: 5 Find the area of sector AOB. units units 2 3.