The given figure shows a solid whose bottom part is a cylinder and top part is a hemisphere. What is the ratio of the curved surface areas of the bottom part and the top part?

The curved surface area of the hemisphere = 2π(Radius)²

The curved surface area of cylinder = 2π × Radius × Height

Thus, the ratio of the curved surface areas of the bottom part and the top part

= $\frac{2\mathrm{\pi rh}}{2{\mathrm{\pi r}}^2}=\frac{h}{r}$