Geometry problem: Triangle Inequality Theorem
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Geometry problem: Triangle Inequality Theorem

[From: ] [author: ] [Date: 12-05-27] [Hit: ]
maybe im doing something wrong.thank you for your time!......
Hello, thank you for taking time to help me out. I have been working on this problem for over a day now and still can't figure it out. I have asked my math teacher and she was unable to help either.

I'm given the following:

AB=6; BC+2AC=18

What can you conclude about AC in triangle ABC?


Since I know two sides of a traingle are greater than the third side i can write three inequalities, each with AC:

AB+BC>AC
AC+BC>AB
AC+AB>BC

I can also figure out that since BC+ 2AC=18 then:

BC=18-2AC


However when i substitute what i already know(AB and BC) it never works for me.

Can someone workout the inequalities? maybe i'm doing something wrong.

thank you for your time! =)

-
Without even using those inequalities you can show using BC+2AC=18 that in order to BC to even exist that AC<9.
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