1. The problem statement, all variables and given/known data If (r, θ) are the polar coordinates of a point then describe the region defined by the restrictions -1 < r < 0, π/2 < θ < 3π/2 2. Relevant equations No clue 3. The attempt at a solution I tried drawing the curve in a polar grid by starting at π/2 and finishing at 3π/2. I was careful to draw it according to the negative values of r. I ended up getting a shape that looked like half of a heart. So my answer was that it was a cardioid.