Question

Express the polar coordinates (3,pi) as Cartesian coordinates please? Will give metal

Answer 1

x = r cosθ = 3 cos(pi) = -3
y = r sin(θ) = 3 sin(pi) = 0

(-3,0)

Answer 2

How'd you do that?!

Answer 3

I just showed you how I did

Answer 4

I know but what I mean is like how'd you know that you needed to use Sin & Cos

Answer 5

because the formula says so.

Answer 6

x = r cosθ, y = r sinθ

Answer 7

So that's what I use for all of my problems like this?

Answer 8

yes

Answer 9

thank you so much! You're a real big help!!