Advertisements
Advertisements
Question
The perimeter of a floor of a room is 30 m and its height is 3 m. Find the area of four walls of the room.
Advertisements
Solution
\[\text { Perimeter of the floor of the room = 30 m } \]
\[\text { Height of the oom = 3 m } \]
\[\text { Perimeter of a rectangle = 2 } \times { \text { (length + breadth) }} = 30 m \]
\[\text { So, area of the four walls = 2} \times \text { (length }\times\text { height + breadth }\times \text { height) }\]
\[ = 2 \times \text { (length + breadth) } \times \text { heigh }t\]
\[ = 30 \times 3 = 90 m^2\]
RELATED QUESTIONS
The dimensions of a rectangular box are in the ratio of 2 : 3 : 4 and the difference between the cost ofcovering it with sheet of paper at the rates of Rs. 8 and Rs. 9.50 per m2 is Rs.1248. Find the dimensions of the box.
Find the volume of a cuboid whose length = 15 cm, breadth = 2.5 dm, height = 8 cm.
An ice-cream brick measures 20 cm by 10 cm by 7 cm. How many such bricks can be stored in deep fridge whose inner dimensions are 100 cm by 50 cm by 42 cm?
The dimensions of a room are 12.5 m by 9 m by 7 m. There are 2 doors and 4 windows in the room; each door measures 2.5 m by 1.2 m and each window 1.5 m by 1 m. Find the cost of painting the walls at Rs 3.50 per square metre.
The surface area of a cuboid is 1300 cm2. If its breadth is 10 cm and height is 20 cm2, find its length.
Total surface area of a box of cuboid shape is 500 sq. unit. Its breadth and height is 6 unit and 5 unit respectively. What is the length of that box ?
A tank 30 m long, 24 m wide, and 4.5 m deep is to be made. It is open from the top. Find the cost of iron-sheet required, at the rate of ₹ 65 per m2, to make the tank.
The height of a rectangular solid is 5 times its width and its length is 8 times its height. If the volume of the wall is 102.4 cm3, find its length.
The length of a cold storage is double its breadth. Its height is 3m. The area of its four walls including doors is 108m2. Find its volume.
