Which of these sets of angle measures could be the three angles in a triangle?

Question

A. 40,50,60

B.50,60,70

C.60,70,80

D.70,80,90

Answer 1

largest can't be larger than the other 2 sides added together. that doesn't help. It doesn't eliminate any of the 4 possibilities.

none of these could be 3 sides of a right triangle. longest is never the square root of the sum of squares of the 2 smaller sides.

but any of them could be 3 sides of a triangle. All of them are close to equilateral triangles. 70-80-90 is closest to an equilateral.