Question

Please Help!
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Wendy described four triangles as shown below:

Triangle A: All sides have length 9 cm.

Triangle B: Two sides have length 10 cm, and the included angle measures 60°.

Triangle C: Two angles measure 50°.

Triangle D: Base has length 8 cm, and base angles measure 45°.

Which triangle is not a unique triangle?

Answer 1

@dan815

Answer 2

why @SolomonZelman

Answer 3

@SolomonZelman

Answer 4

well perhaps its the triangle that isn't isosceles....

as each of the 3 isosceles triangles listed has unique features...

where as all equilateral triangles have some common features...