Surface areas of four solids

Surface areas of four solids

Secondary 2
TGM Original Questions

Using \(\pi=3.142\), find each total exposed surface area, giving decimal answers to 2 d.p. where needed.

  1. A square pyramid has base side 8 cm and each triangular face has slant height 5 cm.
  2. A cone has radius 7 cm and slant height 15 cm.
  3. A hollow hemispherical bowl has concentric outer and inner radii 10 cm and 6 cm; include both curved surfaces and the annular rim.
  4. A closed-base cylinder of radius 9 cm and height 30 cm has a cone of the same radius and slant height 15 cm fixed on top.

Solution:

Solution locked

Sign in to view the step-by-step solution

Similar questions are unavailable for this question.
Answer:(a) \(144\text{ cm}^2\); (b) \(483.87\text{ cm}^2\); (c) \(1055.71\text{ cm}^2\); (d) \(2375.35\text{ cm}^2\).

Need help? Join our JC Math tuition classes.

Learn more