I'm stumped on this:

Which of these describes a unique polygon?

A. A triangle with angles 30 degrees, 50 degrees and 100 degrees

B. A quadrilateral with each side length 5 cm

C. A triangle with side lengths 6cm, 7 cm, and 8 cm

D. A triangle with side lengths 4 cm and 5 cm and a 50 degree angle

Guest Aug 15, 2020