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Last updated at Dec. 12, 2018 by Teachoo
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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) = 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(๐๐+๐โ+โ๐) = 2(2ร1+1ร1.5+1.5ร2) = 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 โ Bottom area = 13 โ 2 = 11 m2
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