Download + Angle Z is an exterior angle. Its remote interior angles are angles 2

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Angle Relationships in
Triangles
Geometry
Farris 2015
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I can find the measure of and
apply the theorems about
interior and exterior angles of
triangles.
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Theorem 4-3-1
Triangle Sum Theorem
The
sum of the angles
measures of a triangle is 180
degrees.
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+ Corollary
- A theorem whose proof follows
directly from another theorem.
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3
2
1
Angle Z is an exterior angle. Its
remote interior angles are angles 2
and 3.
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4-3-4
Exterior Angle Theorem
The
measure of an exterior angle of a
triangle is equal to the sum of the
measures of its remote interior
angles.
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4-3-5
Third Angles Theorem
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