An Important Question of M.L Aggarwal book of class 10 Based on Mensuration Chapter for ICSE BOARD.
You have to Find the curved surface area and the total surface area of a hemisphere if its radius is given.
This is the Question Number 06, Exercise 17.3 of M.L Aggarwal.
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Find: (i) the curved surface area. (ii) the total surface area of a hemisphere of radius 21 cm.
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(i) Given radius of the hemisphere, r = 21 cm
Curved surface area of the hemisphere = 2r2
= 2×(22/7)×212
= 2×22×3×21
= 2772 cm2
Hence the curved surface area of the hemisphere is 2772 cm2.
(ii)Total surface area of the hemisphere = 3r2
= 3×(22/7)×212
= 3×22×3×21
= 4158 cm2
Hence the total surface area of the hemisphere is 4158 cm2.