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6.1
Properties and Attributes of Polygons
Polygon Vocab POLYGON:
Diagonal:
Concave Polygons:
Convex polygons:
Regular polygon:
Name the polygon by how many sides it has.
Sum of interior angles (& each angle!)
Sum interior angles = (n – 2)•180º Ex 1: Find the sum of the measures of interior angles of
the convex polygon: (*Think – how many triangles will it divide into?)
a) hexagon
b) decagon
c) 13-gon
b) 121-gon
Ex 2: Find the value of x
3x-2
3x
3x+4
4x-5
4x
x+3
1) Find sum of all interior angles
2) Set up equation
Ex 3: The sum of the interior angles = 2700º. Find the # of sides.
Ex 4: Find the number of sides (n) of the convex regular polygon if…
(Formula to find the sum of angles: ___________________)
ONE interior angle = 160º
Exterior Angles of a polygon:Find each exterior angle 1 =
2 = 3 = 4 = 5 =
Sum = 54
3
2
1
80 150
120
80
110
Ex 6: Find the value of x
6x
4x - 10
8x + 6
5x + 4
x
For ALL Convex Polygons Sum of exterior angles
Sum = 360º
ONE exterior angle of a regular n-gon is:Exterior = 360
n
In Summary… Sum interior angles of a convex n-gon is:
Sum = (n – 2)180
One interior angle of a regular n-gon is: ( 2)180n
n
Ex 7: Find the measure of each exterior and interior angle if given the # of sides of a regular polygon. 7 sides
Exterior Angle Interior Angle
19 sides Exterior Angle Interior Angle
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