Activity
Illustrative Mathematics

Find the Missing Angle

For Teachers 7th - 9th Standards
This one activity requires young geometers to pull together information they are currently learning with things they have learned previously. Here they rely on understanding something about parallel lines, alternative interior angles,...
Activity
Texas Instruments

Texas Instruments: Vertical, Adjacent, and Supplementary Angles With Cabri Jr.

For Teachers 9th - 10th
Study Vertical, Adjacent, and Supplementary Angles with Cabri Jr. Page numbers come from Prentice Hall Geometry textbook.
Activity
Other

800score: Intersecting Angles

For Students 9th - 10th Standards
Read a description of intersecting lines and all about the different kinds of angles they form. Includes examples.