A classroom is 11 m long, 8 m wide and 5 m high. Find the sum of the a

1.	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.)
Answer» 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

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.)

Answer»

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