SOLUTION: could the following lengths form a trinagle? yes or no 1.) 7,5,2 2.) 9,12,13 3.) 12,2,19

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Question 61050: could the following lengths form a trinagle? yes or no 1.) 7,5,2 2.) 9,12,13 3.) 12,2,19
Answer by joyofmath(189) About Me  (Show Source):
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could the following lengths form a trinagle? yes or no
1.) 7,5,2
2.) 9,12,13
3.) 12,2,19
In a triangle the sum of any two sides must be greater than the third side.
1.) 2+5 is not greater than 7 so not a triangle.
2.) 9+12 > 13. 9+13 > 12. 12+3 > 9. Yes, it's a triangle.
3.) 12+2 is not greater than 9 so not a triangle.