1.08 Day 2 Triangle Angle-Sum Theorem

Click the checkboxes to show the parallel lines, transversals, and angle measures.
Why are the measures of the two angles labeled Angle A (in pink) equal?
Why are the measures of the two angles labeled Angle B (in blue) equal?
What must be the sum of the measures of angles A, B, and C? Why?
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– Katie Acland

Information: 1.08 Day 2 Triangle Angle-Sum Theorem