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Ex 11.3, 4 - Chapter 11 Class 8 Mensuration
Last updated at Dec. 12, 2018 by Teachoo
Transcript
Ex 11.3, 4 Rukhsar painted the outside of the cabinet of measure 1 m Γ 2 m Γ 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 (π) = 2 m Breadth (π) = 1 m Height (β) = 1.5 m Rukhsar painted all except the bottom of the cabinet Area Painted = So, Area Painted = Total surface Area of Cabinet β Area of bottom Total surface area of cabinet Area = Total surface area of cuboid = 2(ππ+πβ+βπ) = 2(2Γ1+1Γ1.5+1.5Γ2) = 2(2+1.5+3) = 2(6.5) = 13 m2 Bottom area of cabinet Area = Length Γ Breadth = 2 Γ 1 = 2 m2 Thus, Area she painted = Total surface area β Bottom area = 13 β 2 = 11 m2
