1. Chapter 11 Class 8 Mensuration
  2. Serial order wise


Example 4 An aquarium is in the form of a cuboid whose external measures are 80 cm × 30 cm × 40 cm. The base, side faces and back face are to be covered with a colored paper. Find the area of the paper needed? Given, Base, Side faces and back faces are covered with colored paper So, except top and front face face, all faces are covered with colored paper Finding Area of Paper needed Area of Paper = Area of paper needed = Area of base face + 2× (Area of side face) + (Area of back face) = (80×30)+2×(30×40)+(80×40) = 2400+(2×1200)+3200 = 5600+2400 = 8000 𝑐𝑚^2 ∴ Area of paper required = 8000 cm2

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.