12.3 Sector Area and Arc Length

Word Definition Picture Formula for Area

Sector of a

Circle

A region bounded by two

_____________ of the circle and

their intercepted ________.

Name of Sector:

2

360

mA r

Example 1: Find the area of sector MPN. Example 2: Find the area of sector EFG.

Word Definition Picture

Segment of a Circle

A region bounded by an _________ and its

______________.

Area of a Segment: The area of a segment is equal to the area of the ____________ minus the area of

the ______________.

Example 1: Find the area of segment ACB.

Example 2: Find the area of segment RST.

Word Definition Picture Formula

Arc Length

The ___________ along an arc

measured in linear units.

Example 1: Find the length of CD . Example 2: Find the length of an arc with measure 35

In a circle with a radius of 3 in.