Angle relationships and unknown angle problems

This lesson first explains supplementary and vertical angles. Then we look at a variety of "angle puzzles", or problems with an unknown angle, and solve those using these basic principles. I also write an equation for each problem, to help students learn to both write and solve equations, since this lesson belongs to my pre-algebra course.

See also

Angles in a triangle — video lesson

Math Mammoth Geometry 3 — a self-teaching worktext with explanations & exercises (grades 4-5)

Back to the geometry videos index

Back to pre-algebra videos index

Back to all videos index