Triangle a: all sides have length 12 cm. triangle b: two sides have length 10 cm, and the included angle measures 60°. triangle c: base has length 15 cm, and base angles measure 40°. triangle d: all angles measure 60°. which triangle is not a unique triangle?

I believe the correct answer from the choices listed above is option D. It would be triangle D where all angles measure 60 degrees that is not a unique triangle. This describes all of the equilateral triangles. Hope this answers the question. Have a nice day.

The number of blank angles would use the variable x if that is what u r asking