Easel by TpT
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Interactive resources you can assign in your digital classroom from TpT.
Learn about Easel

Easel Activities
Pre-made digital activities. Add highlights, virtual manipulatives, and more.
Easel Assessments
Quizzes with auto-grading that will be available for purchase on TpT soon.


Grade Levels
6th - 8th
Formats Included
  • PDF
  • Activity
10 pages
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Includes Easel Activity
This resource includes a ready-to-use interactive activity students can complete on any device. Easel by TpT is free to use! Learn more.


This activity will lead middle school students through constructing triangles and rectangles that are related to each other to determine a method for finding the area of a triangle.

There are three parts of the investigation:

• Finding the area of triangles where there is one horizontal and one vertical side

• Finding the area of triangles where there is one horizontal or one vertical side

• Finding the area of triangles where the vertices at (0,0), (b,0), (c,d).

The investigation ends with the students summarizing what they have discovered.

The directions are given in two formats:

• All four parts on one page, or

• All four parts on four half sheets of paper.

A full set of suggested answers is included.

A sheet of geoboards has also been included if you do not have geoboards.

Comments from buyers:

  • I love using hands on lessons with my middle schoolers, and they love it as well.
  • Good
  • Awesome
  • Great Resource - thank you!
  • Great for a hands on activity
  • While this was challenging for my ELL fifth graders to work through alone, it was a perfect way to help me explain how to find the area of triangles using a tool they know--the geoboard! They wanted to know how to do this after our discussion of areas of rectangles, squares, so I used this whole class. Great job on this...I'm sure your middle school students love this.
Total Pages
10 pages
Answer Key
Teaching Duration
50 minutes
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