This activity is designed to give students the opportunity to discover the relationships between special angle pairs created by a transversal intersecting two parallel lines. The activity leads students to make conjectures about these relationships.
Pre-requisite understandings: Students should have already been introduced to linear pairs and vertical angles. Students should know the meaning of supplementary and congruent. Students should also have an understanding of what it means to classify angle pairs as opposed to classifying angles.
The middle pages of this exploration give students the opportunity to apply the conjectures to find missing angle measurements.
The last pages give students the opportunity to prove the conjectures as theorems. Whether this section is useful to the teacher will depend on how much into proofs the teacher intends to take the students.