Q4 of 18 Page 13

The curved surface area of a right circular cone is 12320 cm2. If the radius of its base is 56 cm. Find its height.

Given, Radius of a right circular cone(r) is 56 cm.
Curved surface area of a right circular cone is 12320 cm2
πrl = 12320
× 56 × l  = 12320
l = = 70
Height of the cone = === 42
Therefore the height of a right circular cone is 42 m.

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2 The volume of a vessel in the form of a right circular cylinder is 448π cm3 and its height is 7 cm. Find the radius of its base. 3 The radius of the base and the height of a right circular cone are 7 cm and 24 cm respectively. Find the volume and total surface area of the cone. 5 Find the volume and the surface area of a metallic sphere having diameter 8.4 cm. 6 The internal and external diameters of a hollow hemispherical vessel are 42 cm and 45.5 cm, respectively. Find its capacity and also its outer curved surface area.