volume of the cubold. 32, ne area of the 4 walls of a room is 60 m2. If the room is 2.8 m long and 1.2 m wide, find the height of the room. long 12m wide and 65 m high indah reas of the four walls and its floor.
Answers
Answer:
It is given that length, breadth and height of a room are 8 m, 5 m and 3 m respectively.
Area of four walls of the room is: 2h(l+b)
A=2h(l+b)=2×3(8+5)=6×13=78 m
2
Area of the ceiling is:
A=l×b=8×5=40 m
2
Total area of the four walls and the ceiling of the room is 78+40=118 m
2
It is given that cost of white washing is Rs.15/m
2
, therefore,
Total cost of white washing is:
118×15=1770
Hence, the cost of white washing the walls is Rs.1770.
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Answer:
Area of four walls = Lateral Surface Area of room =2 h (l+b) sq.units
Given,
lenth, l=13 m
breadth, b=4.5 m
Area of four walls=105 m
2
∴ Area of four walls =2×h×(13+4.5)=105 m
2
2×h×17.5=105 m
2
h=
2×17.5
105
h=
35
105
h=3 m
∴ The height of the room is 3 m
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