Sect 7'5

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Sect 7.5

• TSWBAT find the area of regular polygons.

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Remember?

• Regular Polygon-
• Polygon- plane figure with at least three sides
• Regular- all sides and angles are equal

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Definitions

• Center of a Polygon point equidistant from the
  vertices of the polygon
• Radius segment from the center to a vertex
• Apothem the perpendicular segment from the
  center to a side

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Area of a Regular Polygon

• A ½ (apothem)(perimeter) A ½(a)(p)
• (remember perimeter add up ALL your sides,
  distance around)

a
p
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Examples p382 1 and you try
You TRY
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Examples p382 2 and you try (look for a
patternfind the angles)
You TRY
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Examples p382 3 and you try(look for a pattern)
You TRY
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Example p382 11
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Example p383 13 16
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You Try p383 14 17
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More? Try p384 35 - 37
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Exercises

• P383-384 1-45
• P400 3-5
• P412 2, 5, 6
• WBp86