• ##### Device
• TI-Nspire™ CX
• TI-Nspire™ CX CAS
• TI-Nspire™ Navigator™
• ##### Software

TI-Nspire™
TI-Nspire™ CAS

• ##### TI-Nspire Version

3.9

Geometry: Special Segments in Triangles
by Texas Instruments - Create Your own
TI Math Lesson

Updated on October 06, 2014

#### Objectives

• Students will show why certain segments in triangles are medians, angle bisectors, altitudes, or perpendicular bisectors.
• Students will interpret what properties these particular segments have.
• Students will attend to precision (CCSS Mathematical Practice).
• Students will use appropriate tools strategically (CCSS Mathematical Practice).

#### Vocabulary

• median
• angle bisector
• altitude
• perpendicular bisector

In this activity, students will investigate 4 special segments from a given vertex in a triangle and identify relationships among the special segments and the angles that they form. You decide if you want students to create the figure or to use a figure that has already been created. If you want students to create the figure, give each student a copy of the "Create" handout. This will explain clearly how to create the necessary figure.