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

Transcript

Ex 11.3, 4 Rukhsar painted the outside of the cabinet of measure 1 m ร— 2 m ร— 1.5 m. How much surface area did she cover if she painted all except the bottom of the cabinet. Given cabinet is a cuboid with Length (๐‘™) = 2 m Breadth (๐‘) = 1 m Height (โ„Ž) = 1.5 m Rukhsar painted all except the bottom of the cabinet Area Painted = So, Area Painted = Total surface Area of Cabinet โ€“ Area of bottom Total surface area of cabinet Area = Total surface area of cuboid = 2(๐‘™๐‘+๐‘โ„Ž+โ„Ž๐‘™) = 2(2ร—1+1ร—1.5+1.5ร—2) = 2(2+1.5+3) = 2(6.5) = 13 m2 Bottom area of cabinet Area = Length ร— Breadth = 2 ร— 1 = 2 m2 Thus, Area she painted = Total surface area โˆ’ Bottom area = 13 โ€“ 2 = 11 m2

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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.