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It's been ages since i did any coordinate conversions, and typically i have these two which i just can't manage to solve by myself.

  1. I want to express the circle $x^{2}+y^{2}<4, x<0 $

  2. The Area: $x-|y|\ge 0$

For the first problem i just thought it would be as easy as following:

$$0< r < 2$$

$$\frac {\pi}{2}<\theta<\frac{3\pi}{2}$$

For the second problem i don't even know how to begin...

Best Regards

Joe

2 Answers 2