Question

8. (i) A rectangular room is 6 m long, 5 m wide and 4 m high. Find the total surface area of the four walls.
(ii) If the windows and door in the above room are made up of 20% of the wall area, how much paint will
be needed to give the four walls (excluding the windows and door) two coats of paint if a litre of paint
is used to cover 18 m2 in one coat.​

Answer 1

Answer:

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Answer 2

Answer:

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Step-by-step explanation:

1] Dimensions of the rectangular room=6m×5m×4m

where l=6m, b=5m and h=4m

Total Surface area of the four walls=Lateral surface area of the cuboid

⇒Total Surface area of the four walls=2(bh+lh)

=2h(b+l)

=2×4(5+6)

=88sq.m

∴Total Surface area of the four walls=88sq.m

2] LSA of room 1296m2

area of .......... 20%of 1296 =259.2m2

area left 1036.8m2

paint 57.6 l