2. which of these describes a unique polygon?
a. a triangle with angles 30°, 50', and 100°

b. a quadrilateral with each side length 5 cm

c. a triangle with side lengths 6 cm, 7 cm, and 8 cm

d. a triangle with side lengths 4 cm and 5 cm and a 50° angle

D

Step-by-step explanation:

we know it is not b because it would make a square.

it is not a because if you add all the angles it adds up to 180 so that is fine

we know it is not c because the largest side 8 is less than the two shortest sides that add up to be 13 so we are left with D

hope that helps

step-by-step explanation:

the true ones are a b and d