Length and breadth of a room are 8m and 5m respectively. A red colour border of uniform width of 0.4m has been painted all around on its inside. Then Area of the border is
Answers
Answer:
Step-by-step explanation:
Our question is: Length and breadth of a room are 8m and 5m respectively. A red colour border of uniform width of 0.4m has been painted all around on its inside.
Our aim is to find the area of the border.
We know that a room has four walls, in this case we have a length of 8 m and a breadth of 5 m.
Our info is that the user wants to paint a red colored border around the room. Then we would have two walls with a 0.4 m width and 8 m length, and we would get 2 * 0.4 * 8 of area only for two of the four walls. This would be equal to 6.4.
For the other two walls we will use the same process but instead of 8 m we are now considering a 5m wall. Then we have
2 * 0.4 * 5 = 4.
Thus our total area of the border is equal to 4 + 6.4 = 10.4.
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Answer:
Step-by-step explanation:
New length=8-0.8=7.2
New breadth=5-0.8=4.2
Area of old room=8*5=40
Area of new room=7.2*4.2=30.24
Then area of the border=area of old room-area of new room
=40-30.24
=9.76