Angles Part 4

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Taught by YourMathGal
  • Currently 4.0/5 Stars.
5155 views | 1 rating
Part of video series
Meets NCTM Standards:
Lesson Summary:

In this lesson, Julie Harland defines and explains various angle terms and symbols, such as parallel lines, perpendicular lines, corresponding angles, vertical angles, and transversals. She then uses these concepts to solve two angle problems involving parallel lines and transversals. The lesson emphasizes that all angles on the same side of a transversal crossing two parallel lines have the same measure, and that the smaller angle plus the larger angle always add up to 180 degrees. Visit her website,, to watch more math videos.

Lesson Description:

Problems with angles are done on this video. Transversal, corresponding, alternate and interior angles defined.

More free YouTube videos by Julie Harland are organized at

Questions answered by this video:
  • What does it mean for lines to be parallel and perpendicular?
  • What is a transversal?
  • What are corresponding angles?
  • What are alternate interior and alternate exterior angles?
  • If there are two parallel lines cut by a transversal, how do you find the values of the angle measures if one angle is 72 degrees?
  • If two parallel lines are cut by a transversal, and two vertical angles are a and 7x, and 7x and 2x are on the same side of the transversal, how do you the values of the angle measures?
  • How do you know which angle measures are equal in a figure with two parallel lines cut by a transversal?
  • If two angles are supplementary and one angle is 72 degrees, what is the other angle measure?
  • If 2x and 7x are supplementary, what does x equal and what is the measure of each angle?
  • Staff Review

    • Currently 4.0/5 Stars.
    This lesson goes through examples with parallel lines being cut by a transversal. Then, corresponding, vertical, alternate interior, and alternate exterior angles are used to solve the two problems shown in this lesson. These are very common types of problems for a Geometry class. All logic to determine the measures of the different angles is explained.