Angles in a parallelogram and a triangle

This is a set of three geometry videos dealing with angles.

First, showing that vertical angles are equal:

Next, finding out about the angles in a parallelogram. I start out with two parallel lines and a transversal (line that intersects them both). We explore the angles formed, which some of them are corresponding angles, some are vertical angles. I draw a new line, and get a parallelogram.

Lastly, here is a short and easy proof about the angles in a triangle.

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