A hollow hemispherical bowl has concentric outer and inner radii 10 cm and 6 cm; include both curved

Question

A hollow hemispherical bowl has concentric outer and inner radii 10 cm and 6 cm; include both curved surfaces and the annular rim. Find the total exposed surface area, using $\pi=3.142$ where needed. Give decimal answers to 2 d.p. Outer radius 10 cm; inner radius 6 cm Central section

Accepted Answer

Include the outer curve, inner curve and annular rim. Area $=2\pi(10^2)+2\pi(6^2)+\pi(10^2-6^2)=336\pi=1055.71\text{ cm}^2$.

Exposed surface area

Exposed surface area

Solution:

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