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How many different non-congruent isosceles triangles can be formed by connecting these three of the dots in a 4 x 4 square array of dots like the one shown below. 

Two triangles are congruent if they have the same traced outline, possibly up to rotating and flipping. This is equivalent to having the same set of 3 side lengths. 

 Mar 31, 2021
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There are 22 different non-congruent isosceles triangles.

 Apr 2, 2021

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