Education Technology

Area of a Triangle Between Parallel Lines

Activity Overview

This is an investigation of what happens to the area of a triangle when one vertex moves along a line parallel to the side opposite the vertex.

Before the Activity

Students should know that the area of a triangle depends upon the length of a side and the altitude to that side. Attached documents (Word and PDF) has information about activity.

During the Activity

Students should work in pairs or groups in order to observe and share their conjectures. The attached file contains the TI-Nspire CAS version of the activity.