Question

The total surface area of sphere is 4πr2 and surface of hemisphere 3πr2 instead of 2πr2? Explain

Answer 1

Answer:

Surface of hemisphere 3πr² instead of 2πr² is because 2πr² would only be the area for the curved area not the flat bottom, and surface area includes both the flat bottom area and the curved area

So, area of hemisphere = 2πr² + πr²

                                        = 3πr²

Hope this helps

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