1. Ask students to place the Parallel Lines Cut by 1 Transversal
template in their Communicator®. Ask students to identify each of the
following types of angles in the picture: corresponding angles, alternate
interior angles, alternate exterior angles and angles on the same side of
the transversal.
2. Ask students to place their Communicator® on top of the Parallel
Lines Cut by 1 Transversal template and trace the various angles and use
symbols to illustrate which angles are equal to each other. (Students
should conclude that the corresponding angles are equal, the alternate
interior angles are equal.) Students can trace one of the angles and then
show which other angles are congruent to it by positioning the
Communicator® on top of appropriate angles. Ask students to trace the
interior angles on the same side of the transversal adjacent to each other
and notice what is true. (They are supplementary or total to 180°) Ask
students to trace the exterior angles on the same side of the transversal
adjacent to each other and notice what is true (They are supplementary or
total to 180°) Ask students to write a paragraph completing the following
statement: "When two parallel lines are cut by a transversal, then…." (The
corresponding angles are congruent. The alternate interior angles are
congruent. The alternate exterior angles are congruent. The interior
angles on the same side of the transversal and the exterior angles on the
same side of the transversal are supplementary.)
3. Ask students to place their Communicator® on top of the Parallel
Lines Cut by 1 Transversal template. Ask students to trace this template
on their Communicator®. Ask students to take a standard ruler and add a
line parallel to one of the parallel lines. Ask students to draw a
parallel line using the other side of the ruler. By moving the
Communicator® around to compare sizes of angles, ask students to compare
the new angles created by this new line to the other angles. What can you
conclude? (The same set of angles is created, or a new set of
corresponding, congruent angles is formed because the lines are parallel.)
