Slide22.JPG

Slide23.JPG

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

Transcript

Ex 11.3, 8 The lateral surface area of a hollow cylinder is 4224ใ€– ๐‘๐‘šใ€—^2. It is cut along its height and formed a rectangular sheet of width 33 cm. Find the perimeter of rectangular sheet? Given that Hollow cylinder is converted into a rectangular sheet So, Area of cylinder and sheet must be the same โˆด Curved Surface Area of hollow cylinder = Area of rectangular sheet 4224 = Length ร— Breadth 4224 = ๐‘™ ร— 33 4224/33 = ๐‘™ ๐‘™ = 4224/33 ๐‘™ = 128 cm Now, Perimeter of sheet = 2 ร— (Length + Breadth) = 2 ร— (128 + 33) = 2 ร— 161 = 322 cm

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.