Finding the Area of an Equilateral Triangle

This Finding the Area of an Equilateral Triangle lesson plan also includes:

The problem seems simple: find the area of the equilateral triangle whose sides are each length 1. In fact, this same problem is solved in 8th grade, addressing a different Common Core standard, using the formula for area of a triangle to solve. Here the objective is to get geometry learners develop an understanding of two new solutions. One using congruent triangles, and the other using trigonometric ratios. 

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CCSS: Designed
  • This simple problem reinforces important geometric and trigonometric concepts
  • Well-written explanation of the two different solutions
  • None