Fewpal
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A toy is in the form of a cone of radius 3.5 cm mounted on a hemisphere of same radius. The total height of the toy is 15.5 cm. Find the total surface area of the toy.

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Best answer

Solution: Radius of cone = 3.5 cm, height of cone = 15.5 – 3.5 = 12 cm

Slant height of cone can be calculated as follows:

10 surface area volume exercise solution

Curved surface area of cone can be calculated as follows:

10 surface area volume exercise solution

Curved surface area of hemispherical portion can be calculated as follows:

10 surface area volume exercise solution

Hence, total surface area = 137.5 + 77 = 214.5 sq cm

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