Missing Angle Measures - Geometry Worksheet With Answers

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Missing Angle Measures
Because the sides of a triangle are line segments,
you can extend the sides beyond the triangle itself
exterior angle
to see the exterior angles. You can use what you
know about straight angles to find a missing angle
a
125°
measure. You know that a straight angle is 180°,
so in this example you can subtract 125 from
180 to find the missing angle measure (a
55°).
Find the angle measures for the letters in each figure.
1.
2.
115°
115°
140°
65°
a
a
90°
90°
b
b
105°
155°
3.
4.
150°
a
65°
60°
30°
b
120°
a
b
125°
5.
6.
a
c
75°
30°
40°
a
b
105°
b
120°
c
d

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