TI-84 plus calculator help?

Question

im trying to do this cool picture (by graphing) oon my calc but i cant find "theta" where or what the h**l is that?

Answer 1

You need to change the graphing mode.

Press [ MODE ] and change it to polar mode by selecting "POL" instead of "FUNC".

You then obtain theta, θ, with the same key that you use for "x" when it is in function mode.

Just make sure you switch back afterwards (or remember how to).

Answer 2

under MATH