# Math Help - Prove that in a triangle a^2+b^2+c^2<=9R^2

1. ## Prove that in a triangle a^2+b^2+c^2<=9R^2

Prove that in a triangle $a^2+b^2+c^2\le 9R^2$ where $a,\, b\, c$ are the lengths of the sides and $R$ is the radius of the circumcircle.

2. Drwa the diagram first and then solve the LHS first.

there will be 3 different triangles and take 2 at a time and since they will be congruent by SAS condition(side angle side) replace the a by the R by solving it further.....try it !!!!!!!!!!1