Hi

I have some questions regarding a puzzle.

http://img.geocaching.com/cache/fb69...d5b5f32eea.jpg

This is a logarithmic spiral, and i know that from "Startpunkt" to "A" the direct distance is 86,23. From "Startpunkt" to "B" the direct distance is 75,41.

If i start at "Startpunkt" and measure the spiral where will the point be when the distance is 3000 ?

I have found the definition r = ae^(b*theta), but i don't know how to use it. How do i find the two constants a and b ?

And how do i find the length ?

Regards

Jacob