Solution find the volum of concave surface area total surface area of hemisphere diameter 7 cm
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curved surface area of hemisphere= 2πr²
= 2 x 22/7 x 7 x 7
= 77 cm²
total surface area of hemisphere= 3πr²
= 3 x 22/7 x 7 x 7
= 115.5 cm²
volume of hemisphere= 2/3 π r³
= 2/3 x 22/7 x 7 x 7 x 7
= 89.83 cm³
hope it helps...
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