A wall which is 3 m by 3meters takes up paint costing 900 rupees to cover what is the cost of painting the outside Wall of a circular building of diameter 10 meters which is 10 meter high
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Answer:
Area of the wall =(3×3)m
=9m²
Cost of painting of wall =Rs. 900
:. 9m²=900
1m²= 100
therefore painting of 1m²require Rs.100.
Now, area of outer wall=2×pi×r×h
=2200/7m²
Since, the cost of painting 1m² is RS.100
then, cost of painting 2200/7m² = 2200/7×100
=220000/7
RS =28,571.42
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