Geometry
Name: _________________________________
Guided Notes
Area of Circles and Regions of Circles
Date: _____________________ Period: _____
Area of a Circle - The area of a circle is π times the square of the radius;
A = πr2
Example #1: What is the area of a circle with radius 4 ft.?
Example #2: What is the radius of a circle with area 50 m2?
Example #3: Find the area of the shaded region.
sector of a circle - the region bounded by two radii of the circle and their intercepted arc.
Area of a Sector - The ratio of the area A of a sector of a circle to the area of the circle is equal to the ratio of the
measure of the intercepted arc to 360°.
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=
Example #4: Find the area of the shaded sector.
Geometry
Guided Notes
Area of Circles and Regions of Circles
Example #5: Find the area of the shaded sector.
Example #6: Find the area of the shaded sectors.
Example #7: Find the area of the shaded region.
Name: _________________________________
Date: _____________________ Period: _____