a. Write down the area of four walls of a room and the area of path outside the rectangle. b. A room has the length 8m and height 5m. If the area of four walls is 140m2, find the breadth of the room. Find the area of a rhombus whose diagonals are 15cm and 10cm. C.
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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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