Which demensions cannot create a triangle?

Angles that create a triangle always add up to 180. 

To find sides that create triangles, we have to use the Triangle Inequality Theorem.

It's where side A + B will always be greater than side C

and B + C will always be greater than side A

and A + C will always be greater than side B.

So let's check all of these answers and pick the one that's incorrect.

A.

10 + 25 + 145 = 180?

Correct!

B. 

9 + 15 > 9?

Correct!

15 + 9 > 9?

Correct!

9 + 9 > 15?

Correct!

C. 

40 + 70 + 60 = 180?

Incorrect! 40 + 70 + 60 = 175 which is less than 180.

The answer is three angles measuring 40 m, 70 m, and 60 m.

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