Im trying to work out the answer to the following question

Describe the set in cylindrical coordinates.

x2 +y2 +z2 ≤ 1

you need to find the limit for r, theta and z.

so far i have found that 0 ≤r≤ 1 and pi/4 ≤θ

i havent a clue how to find the rest, can anyone help me?