find the mass of solid cone whose base is of diameter 14 cm and vertical height is 51 cm,supposing that the material of which it is made has density 20 g cm per^3 .also find curved surface area of cone.
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diameter = 14 cm
radius = 7 cm
height = 51 cm
slant height² = 51²+7²
l =51.48
volume of the cone = 1/3πr²h
= 1/3 × 22/7 × 7 × 7 ×51
= 2618 cm²
volume × density = mass
2618 × 20 = 52360 gm
curved surface area = πrl
= 22/7 × 7 × 51.48
= 1132.56 sq.cm
radius = 7 cm
height = 51 cm
slant height² = 51²+7²
l =51.48
volume of the cone = 1/3πr²h
= 1/3 × 22/7 × 7 × 7 ×51
= 2618 cm²
volume × density = mass
2618 × 20 = 52360 gm
curved surface area = πrl
= 22/7 × 7 × 51.48
= 1132.56 sq.cm
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