Find the cost of polishing a square table top of side 3m at the rate of rs.12.50 per sq. metre is *

Question 12 Exercise 11.3

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Answer:

Solution 8:

Diameter= 1.6m

Radius= \frac{1.6}{2}=0.8m^{ }

Area of the table top= \pi r^2

=3.14\times0.8\times0.8m^2

=2.0096m^2

Cost of polishing = Rs 15\times2.0096

=Rs 30.14 (approx)

Video transcript

"Please welcome Toledo homework looking at question number eight right now, which is find the cost of polishing a circular table top of diameter 1.65 and win 6 meter. If the rate of polishing is about 50 rupees per meter Square. First of all, as we are polishing the surface therefore we have to file the area. So area is given as Pi Square now in this case is not given the privilege diameter but radius equal to diameter by 2. So it will be 1 point 6 divided back. So the area will be Pi into 1 Point. Six Maple into 1.6 by this will give you an answer as Pi into 2 .56 upon 2 into 2, which is 4 so after solving this and substituting fires three panels are always remember Eyes by can be anything. You can either use a 3.14 or you can use 22 by 7. But if it is mentioned in the question that you have to use this then you have to use that. All right, if they do will tell you that you have to use three point one four units different so in this Still there told us do you think one more after this our answer for the area will come out to be 2 point 0 0 9 6 meter square right now the next step that remains is that we have to calculate the cost. So the cost of polishing will be 2 point 0 0 9 6 multiplied by 15 because it is rupees 15 per meter. So now the 0.96 will become too small. They find neglected this and taking me to that cost will be told to 15 which will come out with 30 rupees. Thank you so much guys for watching the video. "

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Last updated at Dec. 12, 2018 by

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