the length breadth and height of a hall are 5m , 6m , 7m, respectively . the hall has one door of area 1m * 0.5m . find the cost of painting the halls (only the walls ) at the rate of Rs. 90 sq. meter
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floor and ceiling are rectangles of length X breadth
Walls on the left and right side are : length * height each
Walls on the front (with door) and far in the front of door: breadth * height each
door area = its width * height , this is to be subtracted from the front wall area.
we consider only the inside the hall and not outside wall surface.
Area to paint = 2 * 5 * 7 + 2 * 6 * 7 - 1 * 0.5 = 153.5 square meters
Walls on the left and right side are : length * height each
Walls on the front (with door) and far in the front of door: breadth * height each
door area = its width * height , this is to be subtracted from the front wall area.
we consider only the inside the hall and not outside wall surface.
Area to paint = 2 * 5 * 7 + 2 * 6 * 7 - 1 * 0.5 = 153.5 square meters
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