warm up: 12/15 you must measure the interior angles of the€¦ · 121514 ch 11.1.notebook december...
TRANSCRIPT
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121514 Ch 11.1.notebook December 16, 2014
Warm up: 12/15
Each group will be assigned a shape. You must measure the interior angles of the shape.
1 convex pentagon
2 convex hexagon
3 convex septagon
4 convex octagon
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121514 Ch 11.1.notebook December 16, 2014
By the end of this lesson, you should be able to:
• find the measures of interior angles of a polygon with n sides• find the measures of exterior angles of a polygon with n sides
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121514 Ch 11.1.notebook December 16, 2014
Theorem 11.1 Polygon INTERIOR angles theoremSum of the INTERIOR angles of a convex ngon (polygon with n sides) is: (n2) * 1800
Corollary 11.1 each interior angle of a REGULAR ngon is
or
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121514 Ch 11.1.notebook December 16, 2014
Polygon name # of sides # of triangles sum of the interior angles
Triangle 3
quadrilateral
pentagon
hexagon
Theorem 11.1 Polygon INTERIOR angles theoremSum of the INTERIOR angles of a convex ngon (polygon with n sides) is: (n2) * 1800
Corollary 11.1 each interior angle of a REGULAR ngon is
or
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121514 Ch 11.1.notebook December 16, 2014
3
4
5
6
2
3
4
540 degrees
720 degrees
(n2) 180(n2)
Theorem 11.1 Polygon INTERIOR angles theoremSum of the INTERIOR angles of a convex ngon (polygon with n sides) is: (n2) * 1800
Corollary 11.1 each interior angle of a REGULAR ngon is
or
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121514 Ch 11.1.notebook December 16, 2014
Ex 1: (intermediate step) Find the sum of the interior angles on this 5 sided shape.
114o
135o
105o
102o
x
Ex 2: Find the value of x in the diagram shown.
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121514 Ch 11.1.notebook December 16, 2014
EE1: Find the value of x in the diagram shown.
114o
135o
105o
102o
x
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121514 Ch 11.1.notebook December 16, 2014
40o75o
65o
100o 100o
80o 80o
exterior angles.gsp
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121514 Ch 11.1.notebook December 16, 2014
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121514 Ch 11.1.notebook December 16, 2014
Theorem 11.2 Polygon EXTERIOR angles theoremSum of the EXTERIOR angles of a convex polygon is always 3600
Corollary 11.2 each exterior angle of a REGULAR ngon is
or
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121514 Ch 11.1.notebook December 16, 2014
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121514 Ch 11.1.notebook December 16, 2014
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121514 Ch 11.1.notebook December 16, 2014
Ex 4: (TRICKY!)If the interior angle of a regular polygon is 108o, how many sides does the figure have?
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121514 Ch 11.1.notebook December 16, 2014
Ex 4: (TRICKY!)If the interior angle of a regular polygon is 108o, how many sides does the figure have?
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121514 Ch 11.1.notebook December 16, 2014
Ex 5: (also tricky) If one exterior angle of a regular polygon is 36o, how many sides does the polygon have?
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121514 Ch 11.1.notebook December 16, 2014
By the end of this lesson, you should be able to:
• find the measures of interior angles of a polygon with n sides• find the measures of exterior angles of a polygon with n sides
-homework due tomorrow:6.1
- 2 truths & 1 lie- 20 questions?
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Attachments
exterior angles.gsp
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