I am going through some past papers, and one of the few questions I need help with are:
For the second one, relating to plotting $\sqrt{4 - x^2}$, I made a table of values starting from $0$ until I got math error, and then from behind $0$ until I got maths error, then graphed it. I'm not sure if that is the right way since it took a really long time.
$y \leq 2$ part is easy,
For the first question I found that b is alternate of $\angle ADB$, which has to be $180^\circ - 63^\circ - 47^\circ = 70^\circ$. I also figured that $\angle ADC$ has to be $180^\circ - 47^\circ - 34^\circ = 99^\circ$, and since opposite sides are equal in a parallelogram, a has to be $99- 70=29$. Is this correct?