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

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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