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GeoGebra Classroom

1.08 Day 2 Triangle Angle-Sum Theorem

Author:Katie Acland

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?

Select all that apply

A
They are vertical angles.
B
They are alternate interior angles.
C
They are corresponding angles.
D
They are linear pairs.

Check my answer (3)

Why are the measures of the two angles labeled Angle B (in blue) equal?

Select all that apply

A
They are vertical angles.
B
They are alternate interior angles.
C
They are corresponding angles.
D
They are linear pairs.

Check my answer (3)

What must be the sum of the measures of angles A, B, and C? Why?

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