Q2 of 12 Page 108

A cuboid shape soap bar has volume 150 cc. Find its thickness if its length is 10 cm and breadth is 5 cm.

Given:


Volume of soap bar = 150 cc


Length = 10 cm


Breadth = 5 cm


Height = ?


The volume of cuboid = l × b × h


150 = 10 × 5 × h




h = 3 cm


The height of soap bar is 3 cm


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How many bricks of length 25 cm, breadth 15 cm, and height 10 cm are required to build a wall of length 6 m, height 2.5 m, and breadth 0.5 m?

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In each example given below, the radius of the base of a cylinder and its height are given. Then find the curved surface area and total surface area.

(1) r = 7 cm, h = 10 cm


(2) r = 1.4 cm, h = 2.1 cm


(3) r = 2.5 cm, h = 7 cm


(4) r = 70 cm, h = 1.4 cm


(5) r = 4.2 cm, h = 14 cm