1. ## Geometry inequality

Hi!Can anyone help me with this?

2. ## Re: Geometry inequality

WHAT is the question?
You gave us an equation only...

3. ## Re: Geometry inequality

We have to proof that (4R+r)^9>=....

4. ## Re: Geometry inequality

Originally Posted by AlexC
We have to proof that (4R+r)^9>=....
What are we given about $\Delta ABC~?$ Is it simply any triangle?

Some authors use $R$ for the circumradius and $r$ for the inradius. Is that the case here?

5. ## Re: Geometry inequality

Sorry, i found out that the problem was wrong. The correct problem is:
In triangle Abc.
Prove that (4R+r)^9>=19683/4*(R^2*p^6*r)

6. ## Re: Geometry inequality

Sorry. This is the correct problem. ABC is a simply any triangle

7. ## Re: Geometry inequality

Originally Posted by AlexC
Sorry. This is the correct problem. ABC is a simply any triangle
That is a useless posting. Why not just post the entire question with all details?

8. ## Re: Geometry inequality

This is the entire question with all details. In any triangle ABC, we have to proof that (4R+r)^9>=...