To calculate the area of a composite shape you must divide the shape into rectangles, triangles or other shapes you can find the area of and then add the areas back together. You may have to ...

Composite 3D solids can be created from simple ... times \pi \times 1.5^3 = 42.4~\text{cm}^3\) Total surface area of the salt shaker = surface area of cylinder + surface area of hemisphere.