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

Transcript

Ex 11.3, 6 Describe how the two figures at the right are alike and how they are different. Which box has larger lateral surface area? Similarity Both the figures have same length (= 7 cm) and same height (= 7 cm) Difference Figure (a) has circular bottom and top & Figure (b) has square bottom and top. Figure (a) is a cylinder and Figure (b) is a cube. Figure (a) is a cylinder and Figure (b) is a cube. We also need to find which box has larger surface area Lateral Surface Area of Cylinder Radius = r = 7/2 cm Height = h = 7 cm Lateral surface area of cylinder = 2𝜋𝑟ℎ = 2×22/7×7/2×7 = 22 × 7 = 154 cm2 Lateral Surface Area of Cube Side of cube = 7 cm Lateral surface area of cube = 4(Side)2 = 4 × 72 = 4 × 49 = 196 cm2 So, Cube has larger lateral surface area

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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.