The following scalene triangle is formed from 14 toothpicks. We can describe this triangle as a 3-5-6 triangle.
Use toothpicks to answer each of the following questions.
a. How many different isosceles triangles can you form using 20 toothpicks? (NOTE: You may have no gaps or overlapping toothpicks, and you may not break toothpicks.)
b. How many different scalene triangles can you form using 20 toothpicks?
c. How many different equilateral triangles can you form using 20 toothpicks?
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