# SOLUTION: Hi I have a question about how to find out if a set of three numbers can be sides of a triangle or not. I remember doing this in class, & I remember that it was really easy... I th

Algebra ->  Algebra  -> Triangles -> SOLUTION: Hi I have a question about how to find out if a set of three numbers can be sides of a triangle or not. I remember doing this in class, & I remember that it was really easy... I th      Log On

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 Geometry: Triangles Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Triangles Question 195490: Hi I have a question about how to find out if a set of three numbers can be sides of a triangle or not. I remember doing this in class, & I remember that it was really easy... I think it's something like if you get a certain number from using the Pythagorean Theorem, it's a right triangle, if you get this number, it's an acute, etc.... I just don't remember what exactly to do, although I do recall that it involves the Pythagorean Theorem, correct? I don't have the notes from this b/c I cleared out my binder. It gets too full if I keep all of the papers from the entire year, so I take old chapters out. No, I don't know any Pythagorean triplets, & no i don't think the units matter. This is all I remember.... This is the question: Which of the following could not be the lengths of the sides of a triangle? A: 5km, 2km, 4km B: 3cm, 4cm, 5cm <== might be a triplet... C:4in, 6in, 8in D:6ft, 3ft, 9ft Thank you in advance, I'd love your help! :DAnswer by stanbon(57323)   (Show Source): You can put this solution on YOUR website!Which of the following could not be the lengths of the sides of a triangle? A: 5km, 2km, 4km B: 3cm, 4cm, 5cm <== might be a triplet... C:4in, 6in, 8in D:6ft, 3ft, 9ft --------------------- This is not a Pythagorean problem. You are not checking to see if you have a right triangle. You want to know if the three sides could be the sides of a triangle (any triangle). ---- Criteria: The sum of every two sides must be greater than the 3rd side. Example: sides of 1,2, and 7 could not be a triangle. ------------ Your Problem. 6,3,9 would not form a triangle. Try it and you'll see. ============================ Cheers, Stan H.