Geometry problem

[rtfm]

Hi,
Given:

1. Swept wing. Sweep (in degrees) along 25% chord
2. Root chord
3. Tip chord
4. Length along 25% chord

To find:
The sweep back distance at the LE of the tip (relative to the root chord LE)

I have tried all the high school maths I can remember, and nothing seems to present itself. I have been resorting to plugging the above numbers into DevWing software, which does the calculations for me. But it is a hassle, and I'd like a more interactive solution which can be implemented in my Excel spreadsheet.

Thanks,
Duncan

 

[Aviator168]

 

[Matt G.]

 

[Topaz]

 

[wizzardworks]

 

[rtfm]

 

[Doggzilla]

 

[Doggzilla]

 

[Starman]