RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 21. Mensuration-II (Volumes and Surface Areas of a Cuboid and a Cube)

Subject: Maths - Class 8th

Q. No. 10 of Exercise 21.3

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10

A classroom is 11 m long, 8 m wide and 5 m high. Find the sum of the areas of its floor and the four walls (including doors, windows etc.)

Given,


Dimensions of class room = 11m × 8 m ×5 m


Where,


Length = 11m , Breadth = 8m , Height = 5 m


Ten,


Area of floor =


Area of four walls ( including doors & windows) =


=


Sum of areas of floor and four walls = area of floor + area of four walls


= 88 + 190 = 278 m2


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