How many different non-congruent isosceles triangles can be formed by connecting three of the dots in a 4 x 4 square array of dots?

Question
Answer:
The answer is:  9

There are 9 kinds of non-congruent isosceles triangles that can be formed by connecting three of the dots in a 4 x 4 square array of dots

The attached figure represents the explanation of the answer.

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general 10 months ago 9273