 # RD Sharma Solutions Class 8 Mathematics Solutions for Volume Surface Area Cuboid Cube Exercise 21.3 in Chapter 21 - Volume Surface Area Cuboid Cube

Question 10 Volume Surface Area Cuboid Cube Exercise 21.3

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 details are,

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

Where, Length = 11m, Breadth = 8m, Height = 5m We know,

Area of floor = length × breadth

= 11 × 8

= 88 m2

Area of four walls (including doors & windows) = 2 (lh + bh) cm2

= 2 (11×5 + 8×5)

= 2 (55 + 40)

= 2 (95)

= 190m2

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

= 88 + 190 = 278 m2

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