Find the constant C given Joint PDF

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I just want to ask part(a). My attempt is find the x and y first, which means 0<=x<= $\sqrt{R^2-y^2}$, and 0<=y<= $\sqrt{R^2-x^2}$. And base on this observation, do the double integration. Am I correct?

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For part (a), note that $$ 1=\int_{D}c\,dA=c\int_{D}\,dA=c\text{Area}(D) $$ where $D=\{(x,y)\mid x^2+y^2\leq R^2\}$. The area of a disk is well known.