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Total Surface Area of Hemisphere: The total surface area of Hemisphere of radius r is given by
Illustration: Find the surface area and total surface area of a hemisphere each of radius 10cm. .
Solution: We have, r = 10cm
Surface Area
Total Surface Area =
Illustration: The radius of a hemispherical balloon increases from 7 cm to 14 cm as air is being pumped into it. Find the ratios of the surface areas of the balloon in the two cases.
Solution: Let and be the surface areas of the hemispherical balloon when its radii are 7 cm and 14 cm respectively. Then,