3.5 Polygon Angle Sum Theorem - Poudre School District
3.5 Polygon Angle Sum Theorem
October 09, 2009
35 Polygon Angle Sum Theorem
Objectives
Explore the patterns found in the angles of polygons. Identify formulas for finding interior and exterior angles of a polygon.
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3.5 Polygon Angle Sum Theorem
October 09, 2009
EXPLORATION
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3.5 Polygon Angle Sum Theorem
October 09, 2009
Number of sides (n) Number of triangles formed
4 5 6 7 8
Sum of interior angles
Sum of exterior angles
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3.5 Polygon Angle Sum Theorem
October 09, 2009
4 sides
5 sides
6 sides
___ triangles
___ triangles
___ triangles
7 sides = ___ triangles 8 sides = ___ triangles
n sides = _____ triangles
A triangle has 180 degrees, so multiply the number of
triangles by 180.
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3.5 Polygon Angle Sum Theorem
October 09, 2009
Number of sides (n) Number of triangles (n2)
4
(42) = 2
5
(52) = 3
6
(62) = 4
7
(72) = 5
8
(82) = 6
Sum of interior angles (n2)180
(42)180 = 360
(52)180 = 540 (62)180 = 720 (72)180 = 900
(82)180 = 1080
Sum of exterior angles
n
(n2) =
(n2)180 =
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