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10 May 2012
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iClassify Triangles: Part 2

This post is a follow-up to the original iLesson “iClassify Triangles“. The original lesson provides a few direct instruction videos on classifying triangles, a set of mystery triangle flash cards, and a handful of extension app-tivities. The following could be used as a stand-alone geometry resource or an additional app-tivity to support the initial iLesson.

Student Task: Use the Geoboard app to make an example triangle for each of the following triangles using the specified color:

  1. Yellow: obtuse isosceles
  2. Red: scalene right
  3. Purple: right isosceles
  4. White: acute scalene
  5. Green: acute isosceles
  6. Orange: obtuse scalene


Classifying Triangles with Geoboad app


Extensions: Complete the question and one of the tasks below.

  1. Question: Which triangle can you not make and why? acute equilateral
  2. Task 1: Take a screenshot and bring the completed Geoboard image up in Skitch. Calculate the perimeter and area of each of the triangles.
  3. Task 2: Graph triangles in Geometry Pad. (Teacher could provide a task card with specific directions: e.g. “graph an isosceles right triangle in quadrant 2”).

 Check out these other Math iLessons.