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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:
- Yellow: obtuse isosceles
- Red: scalene right
- Purple: right isosceles
- White: acute scalene
- Green: acute isosceles
- Orange: obtuse scalene
Extensions: Complete the question and one of the tasks below.
- Question: Which triangle can you not make and why? acute equilateral
- Task 1: Take a screenshot and bring the completed Geoboard image up in Skitch. Calculate the perimeter and area of each of the triangles.
- 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.