Q8 of 24 Page 143

Find the cost of whitewashing the four walls of a cubical room of side 4 m at the rate of ₹ 20/ m2.

Given Side of a cubical room = 4m

So, Lateral Surface Area of a Cube = 4(side of a cube)2


= 4 (4)2


= 64m2


Cost of white washing per square meter = ₹20


Cost of white washing for 64 m2 = ₹20 × 64 = ₹1280


Cost of white washing the four walls of a cubical room is ₹1280


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The total surface area of a cube is 384 cm2. Calculate the side of the cube.

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The L.S.A of a cube is 64 cm2. Calculate the side of the cube.

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A cubical box has edge 10 cm and another cuboidal box is 12.5 cm long, 10 cm wide and 8 cm high.

(i) Which box has a smaller total surface area?


(ii) If each edge of the cube is doubled, how many times will its T.S.A increase?

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Find the total surface area and volume of a cube whose length is 12 cm.