Q19 of 45 Page 11

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: Length of classroom = 11 m


Width of classroom = 8 m


Height of classroom = 5 m


To find: The sum of areas


Formula Used:


Area of rectangle = Length × Width


Explanation:


For given dimensions:


Area of floor = length × breadth


= 11 × 8


=88 m2


Area of four walls (including doors & windows) = 2 (l × h + b × h)


=2(11×5+8×5)


= 2(55+40)


= 190 m2


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


= 88 + 190 = 278 m2


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