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Exterior Angles of a Triangle

Published on Dec 11, 2015

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Exterior Angles of a Triangle

E.Q.: How do we find the exterior angle of a triangle?
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A.P.K.

Angle Sum says...
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Exterior Angle?

How do we find the
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What is angle 1?

Collaborate
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What is angle 1?

Hint: The exterior angle equals the sum of the interior
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angle 1 + angle 2 = angle 3

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angle 1 + angle 2 = angle 3

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Exterior Angle Theorem

Exterior angle equals the sum of the measures of the two interior angles
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Example. Find the value of x.

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Untitled Slide

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x=118

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Example 2: Find the value of x.

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Untitled Slide

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x = 60

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Try This. Find the value of y. 

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Untitled Slide

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x = 42

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Summary

E.Q.: How do we find the exterior angle of a triangle?
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Key Words

  • Exterior Angle
  • Interior Angle
  • Exterior Angle Theorem
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What is the difference between the angle sum and exterior angle theorem?

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