10-3 areas of regular polygons 2011.notebook
TRANSCRIPT
103 Areas of Regular Polygons 2011.notebook
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February 25, 2011
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WarmUpFind the area of the following regular polygons....
4 m
7 m
1. 2.
12 m
8 m
6 m
13 m
5 m
3.
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103 Areas of Regular Polygons
Objective: To find the area of a regular polygon.
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The apothem (ap' uh them) is the perpendicular
distance from the center to a side.
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123
Finding Angle MeasuresExample 1:The figure at the right is a regular pentagon with radii and an apothem drawn. Find the measure of each numbered angle.
1
3
2
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Example 2:At the right, a portion of a regular octagon has radii and an apothem drawn. Find the measure of each numbered angle.
103 Areas of Regular Polygons 2011.notebook
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February 25, 2011
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Finding the Area of a Regular PolygonExample 3:Find the area of a regular decagon with a 12.3 inch apothem and 8 inch sides.
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Example 4:Find the area of a regular pentagon with 11.6 cm sides and an 8 cm apothem.
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10 in.
a
Example 5:Find the area of a regular hexagon with 10 inch sides.
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Example 6:The apothem of a regular hexagon is 4√3. Find the area of the hexagon.
__
4√3_
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Example 7:The apothem of a triangle is 3 m. Find the area of the triangle.
3 m