Question

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

Triangle C: Two angles measure 50°.

Explanation:

Answer 2

When angles are the only specification, one side can be any length you want. The triangle is not uniquely specified by its angles.

The appropriate choice is ...

... Triangle C: Two angles measure 50°.