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If two sides of a triangle are 9 and 15. The possible third side is

 Jan 27, 2021
 #1
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+1

15 - 9 = 6

15 + 9 = 24. 

 

If degenerate triangles are allowed, then the interval is [6, 24]. 

If non including degenerate triangles, the interval is (6, 24).

 

I hope this helped. :)))

=^._.^=

 Jan 27, 2021
edited by catmg  Jan 27, 2021
 #2
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Will the side lengths below form a triangle? 15, 12, 9

yes or no

 Jan 27, 2021
 #3
avatar+382 
+1

Yes because 9 + 12 > 15.

 

=^._.^=

catmg  Jan 27, 2021

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