Exterior Angles of Regular Polygon

Presentation

•

Mathematics

•

10th Grade

•

Medium

Lina HP

Used 6+ times

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12 Slides • 13 Questions

Exterior Angles of Regular Polygon

Sum of Exterior Angle = 360^o

Remember this:

Any polygons will have the same value of sum of exterior angles

What is Exterior angle?

Triangle

Sum of exterior angle =

An exterior angle =

Pentagon

Sum of exterior angle =

An exterior angle =

Example 1

Find b

Example 2

Find the exterior angle of a regular Decagon

Answer:

Decagon have 10 sides

n = 10

An exterior angle

QUIZ

Get ready with your calculator

Fill in the Blanks

Find a

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Find b

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Find c

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Find d

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Find a

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Find a

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Find b

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What is the size of an exterior angle on a regular 18 sided shape?

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What is the size of an exterior angle on a regular 9 sided shape?

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A regular polygon has exterior angles of size 18⁰, how many sides does it have?

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A regular polygon has exterior angles of size 4⁰, how many sides does it have?

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Interior angle + Exterior angle = 180^o

Example 3

A regular polygon has an interior angle of 171⁰. What is the exterior angle and hence, how many sides does the polygon have?

Answer:

Exterior angle = 180^o - 171^o = 9^o

Number of sides=

Fill in the Blanks

A regular polygon has an interior angle of 157.5⁰. What is the exterior angle and hence, how many sides does the polygon have?

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A regular polygon has an interior angle of 120⁰. What is the exterior angle and hence, how many sides does the polygon have?

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What have you learn today?

and........

Exterior Angles of Regular Polygon

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