# Thread: mechanics reference points.

1. ## mechanics reference points.

Hey guys i've just been working out neutral axis points above a plain and i need to work out the lna of a rectangle. The equation i have been given id $bd^3(/)12$ although im not sure what the d stands for in this equation. Any help on this would be great.

cheers

2. Originally Posted by the_sensai
Hey guys i've just been working out neutral axis points above a plain and i need to work out the lna of a rectangle. The equation i have been given id $bd^3(/)12$ although im not sure what the d stands for in this equation. Any help on this would be great.

cheers
$\frac{bd^3}{12}$

Where:
• $b =$ Width of beam
• $d =$ Depth of beam