This is the Teacher's Guide that accompanies Geometry Applications: Angles and Planes.

Archer Fish are amazing hunters, spraying water on insect prey to knock them into the water.

This hands-on activity is a companion to the video segment from the Geometry Applications: Angles and Planes video. In particular, it supports the segment on the architecture of Himeji Castle.

This set of tutorials provides 26 examples of how to find the length of a side of a triangle using given angle or side measurements.

This set of tutorials provides 48 examples of angles and how to identify angles by their measurement. NOTE: The download is a PPT file.

In this Slide Show, we show how to construct an isosceles triangle. This presentation requires the use of the TI-Nspire iPad App. Note: the download is a PPT.

In this Slide Show, we show how to construct the perpendicular bisectors of the three sides of a triangle to show they intersect at a single point. This presentation requires the use of the TI-Nspire iPad App. Note: the download is a PPT.

In this Slide Show, learn how to use the TI-Nspire App to construct an isosceles triangle. Note: The download is a PPT file.

In this Slide Show, learn about the geometry of castle construction.

In this tutorial, learn what the Angle Addition Postulate is and how to use it to solve problems.

This interactive crossword puzzle tests knowledge of key terms on the topic of triangles.

Use this math game to review triangles. This is a Memory-style game in which students must remember the location of pairs of identical images.