Guided notes on 2-3 Parallel Lines and Triangle Angle Sums from enVisions. Includes Triangle Sum Theorem and Exterior Angle Theorem- work space for students to complete the notes. There is an answer key provided as well.

You can use my notes or edit notes based on your curriculum or class.

**Does not include all examples from enVisions 2-3, but you may edit and add more examples if you need

Standards

HSG.CO.C.9: Prove theorems about lines and angles.

HSG.CO.C.10: Prove theorems about triangles.