The diagram shows a sold glass paperweight made from hemisph

The diagram shows a sold glass paperweight, made from hemisphere on top of a cyclinder. The high of the cylinder is 20mm. The radius of the cylinder is 4mm.

How to calculate total volume and surface area of the paperweight.

Solution

Total volume of paper weight = (pi.(4)^2.20) + (2/3).(pi).(4^3) = (3.14×16×20) + (0.66×3.14×8) = 1137.43 mm^3

Total Surface area = (2×3.14×4×20) + (3.14 × 16) + (2×3.14 ×16) = 653.12mm^2