# 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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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