Use the Law of Cosines to prove that the distance between 2 polar points (r1, θ1) and (r2, θ2) is d2=r12+r22-2r1r2cos(θ2-θ1)
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: .