Question

The perimeter of floor of a room is 30.cm and height 3m find the area of four walls of the room

Answer 1

look,it's simple.

perimeter of rectangle=2(l+b)
height is 3m.

now the formula used for finding surface are of walls is 2h(1+b)

here you can clearly see there is 2(l+b) when you remove h.so the procedure is as follows

perimeter=2(l+b)
=30 m(already given)

height=3m(also given)

therefore,
2h(l+b)
or can be written as 2(l+b)h
which is 30×3 m
=90m square

therefore the area of wall of room is 90 m ^2.

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hope helped.

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