The surface area of a sphere can be derived by ddR(43πR3)\frac{d}{dR}\left(\frac{4}{3}\pi R^3\right)dRd(34πR3). This equals:
4πR24\pi R^24πR2
2πR22\pi R^22πR2
4πR4\pi R4πR
4π3R2\frac{4\pi}{3}R^234πR2