Hello, rwc123!

I don't see any difficulty . . . am I missing something?

Using the Law of Cosines

. . prove that the distance between 2 polar points

. . is given by:. .Code:B * * * * * d * * * * r2 * * A * * * θ2 - θ1 * * * r1 * * * * O *

We have: .

Law of Cosines:

. . .

Therefore: .