Unit 1, Lesson 16
Parallel Lines and the Angles in a Triangle
Grade 8
Practice
Problem 1
For each triangle, find the measure of the missing angle.
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For each triangle, find the measure of the missing angle.
In this diagram, lines
Angle
Here is a diagram of triangle
What do you notice about these three angles?
Three lines intersect to form Triangle D E F. The interior angle at D is labeled 80 degrees. The exterior angle at D is labeled q. The interior angle at E is labeled 45 degrees. The exterior angle at E is labeled r. The exterior angle at F is labeled s.
The two figures are congruent.
Two congruent figures are semicircles with a connected opposite angle point. The left figure has point A on the bottom angle point, point B on the right side where the semicircle and segment AB meet and point C on the midpoint of the top semicircle. The right figure has the semicircle on the bottom with a point on the midpoint, a point on the left side where the semicircle and segment meet and a point at the top angle point.
Two congruent figures are semicircles with a connected opposite angle point. The left figure has point A on the bottom angle point, point D on the left side below where the semicircle and segment AB meet and point C on the midpoint of the top semicircle. The right figure has the semicircle on the bottom with a point on the midpoint, and a point at the top angle point.