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The total surface area of a hemisphere is 1039.5 cm2. Find its diameter (in cm).1). 212). 10.53). 424). 31.5

Answer»

We know, total surface AREA of a HEMISPHERE = 3πr2

So, total surface area of a hemisphere = 1039.5

⇒ 3πr2 = 1039.5

3 × 22/7 × r2 = 1039.5

⇒ r2 = 110.25

⇒ r = 10.5

∴ Diameter of the hemisphere = 10.5 × 2 = 21 cm


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