Overview
The purpose of this lesson is to learn how angles are related to each other on a set of two parallel lines cut by a transversal.
This lesson will address the following CCRS Standard(s) for Geometry:
- 7.G.5: Use facts about supplementary, complementary, vertical, and adjacent angles in a multi-step problem to write and solve simple equations for an unknown angle in a figure
- 8.G.5: Use informal arguments to establish facts about the angle sum and exterior angles of triangles, above the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles. For example, arrange three copies of the same triangle so that the sum of the three angles appears to form a line, and give an argument in terms of transversals why this is so
Directions
- Take notes while watching videos below
- Go to http://wamap.org and log into our course to complete assignment 1.B with 80% or better.
Watch
Parallel Lines and Transversals [9:40]
Do
Complete assignment 1.B with 80% or better at http://wamap.org
Summary
In this lesson we have learned:
- If two parallel lines are cut by a transversal, all the acute angles are congruent to each other and the all the obtuse angles are congruent to each other.
- If to parallel lines are cut by a transversal, then any of the acute angles will be supplementary to any of the obtuse angles.