Unit 1, Lesson 16, Grade 8 icon
Unit 1, Lesson 16

Parallel Lines and the Angles in a Triangle

Open Up Resources 45 min(s)

Parallel Lines and the Angles in a Triangle Use rigid transformations to informally establish the Triangle Sum Theorem, that the sum of the angle measures in a triangle. Let's see why the angles in a triangle add to 180 degrees. Learning targets: students can explain using pictures why the sum of the angles in any triangle is 180 degrees.

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