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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.
