Originally Posted by

**berniecole** I want to find the height of a pole H

From a distance, I measure the angle (Theta 1) to the top of the pole.

I then move a distance D towards the pole and measure the angle to the top of the pole again (Theta 2). I do not know my distance from the pole so call it X

I know that H/X=Tan(Theta 2) **(1)**

I also know that H/(X+D)=Tan(Theta 1) **(2)**

I know by transposition that H=X(tan(Theta 2)) & H=(X+D)(Tan(Theta 1))

To find H I need to find X

This is where I get lost in my Transposition!!

Can anybody please help me, I'm loosing a lot of sleep over this