# Thread: [SOLVED] help with difficult geometry problem

1. ## [SOLVED] help with difficult geometry problem

solved

2. Originally Posted by oohhoohh
- angle EAB is a right angle
- line AC and line AD trisect angle EAB
- line EA = 24
- line AB = 10

find the length of line AD

...
1. Determine the angle at E:

$\tan(E)=\frac{10}{24}$

2. Now you know all interior angles of the triangle EDA. Use Sine rule to calculate the length of AD.

3. if you don't know sine rule yet:

draw a line from A perp to EB, call that intersection F
get angle E or angle B
then get the length of AF