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Ex 13.1, 1 - A plastic box 1.5 m long, 1.25 m wide and - Ex 13.1

Ex 13.1, 1 - Chapter 13 Class 9 Surface Areas and Volumes - Part 2

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Ex 13.1, 1 - Chapter 13 Class 9 Surface Areas and Volumes - Part 3

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Ex 13.1, 1 A plastic box 1.5 m long, 1.25 m wide and 65 cm deep, is to be made. It is to be open at the top. Ignoring the thickness of the plastic sheet, determine: (i) The area of the sheet required for making the box. Given that length (l) of box = 1.5 m Breadth (b) of box = 1.25 m Depth (h) of box = 65 cm = 65/100 m = 0.65 m Area of sheet required = Area of cuboid Area of top which is open = 2(lb + bh + lh) lb = 2(lb) + 2(bh) + 2(lh) lb = lb + 2(bh) + 2(lh) = [1.5 1.25 + 2 1.25 0.65 + 2 1.5 0.65 ] m2 = (1.95 + 1.625 + 1.875) m2 = 5.45 m2 Ex 13.1, 1 A plastic box 1.5 m long, 1.25 m wide and 65 cm deep, is to be made. It is to be open at the top. Ignoring the thickness of the plastic sheet, determine: (ii) The cost of sheet for it, if a sheet measuring 1 m2 costs Rs 20. Area of sheet required = 5.45 m2 Cost of sheet per 1 m2 area = Rs 20 Cost of sheet of 5.45 m2 area = Rs (5.45 20) = Rs 109

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.