11.5 Circle and Area of Sector
Warm-Up
Area of a Circle: pi times the radius squared
1. Find the radius of the CD.
What is the area of the figure below?
2. Find the Diameter:
Sector of a Circle: is the region bounded by 2 radii of the
circle and their intercepted arc.
Formula: Area of a Sector
How can you find the area of a fourth of a circle with diameter of 10? How many degrees would it be?
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11.5 Circle and Area of Sector
Extra Circle Area Problems:
a)
In this large circular painting, two congruent
circles just fit into a gray circle.
What is the area that appears gray?
Examples: Area sector
a)
b)
H
b)
3.
hw: p. 758 # 3-9, 11-18, 26-31
4.
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