The answer for this is 21/6 km from D.
Will the formula be:
d = AS + BS?
What variable am I supposed to isolate?
I have the two right triangles but not sure how to find the distance from C to S or the distance from D to S. The whole thing is 6 km so will it just be 3 km and then do I find the hypotenuse?
I'd find it with Pythagoras.
So will it be:
(5)^2 + (3)^2 = AS^2
AS = 5.83
For BS^2, I'd write:
7^2 + (6-x)^2 = BS^2.
The correct answer according my text book is different though. :S