Question

Which set of numbers does not create a triangle?

115 cm, 65 cm, 1.5 m

5 m, 9 m, 1500 cm

12.5 ft, 3 yd, 19.75 ft

6 yd, 33 ft, 15 yd

Answer 1

If A, B, C are the sides of the triangle, A< B+C and A> B-C

Answer 2

add any two "sides". if they sum up to more than the third, then that's the choice.
be careful to make the units all the same before adding.