Education Technology

Area of Triangle

Activity Overview

This Cabri Geometry activity enables students to review the relationship between the height of a triangle and its perimeter and area.

Before the Activity

  • Download the Cabri Geometry™ software on the computer
  • See the attached FIG file for details of this activity

  • During the Activity

    Follow the Activity procedure:

  • Drag point B around the screen and examine the height, area, and perimeter of the triangle
  • Note that if the position of B is changed keeping the height constant, the perimeter changes, but the area remains same
  • Observe that if the height of the triangle is increased, the area and perimeter also increase
  • After the Activity

    Review student results:

  • As a class, discuss questions that appeared to be more challenging
  • Re-teach concepts as necessary