Question

The length of a cinema hall is 10m and breadth is 8m.The sum of the areas of the floor and flat roof is equal to the area of four walls.Find the height of hall and then find total surface area.​

Answer 1

Step-by-step explanation:

Let the height of the hall be h metres

We have, l=18m and b=12m

Now,

Sum of the areas of the floor and roof = Sum of the areas of four walls

2lb=2(l+b)h

7.2m

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