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Find the volume, lateral surface area and the total surface area of the cuboid whose dimensions are:
(i) length = 22 cm, breadth = 12 cm and height = 7.5 cm
(ii) length = 15 m, breadth = 6 m and height = 9 dm
(iii) length = 24 m, breadth = 25 cm and height = 6 m
(iv) length = 48 cm, breadth = 6 dm and height = 1 m
A cylinder is open at both ends and is made of 1.5-cm-thick metal. Its external diameter is 12 cm and height is 84 cm. What is the volume of metal used in making the cylinder? Also, find the weight of the cylinder if 1 cm ' of the metal weighs 7.5 g.
Hint. External radius = 6 cm, internal radius = 4.5 cm.
Volume of metal =
Fill in the blanks:
(i) If l, b, h be the length, breadth and height of a cuboid, then its whole surface area = (………… ) sq units.
(ii) If l, b, h be the length, breadth and height of a cuboid, then its lateral surface area = (…………… ) sq units.
(iii) If each side of a cube is a, then its lateral surface area is………..sq units.
(iv) If r is the radius of the base and h be the height of a cylinder, then its volume is (………….. ) cubic units.
(v) If r is the radius of the base and h be the height of a cylinder, then its lateral surface area is (…………. ) sq units.