The cost of canvas required for a conical tent of height 8m and diameter of base 12m at the rate of Rs.3.50 per m2 is:
Rs.620
Rs.600
Rs.640
Rs.660
A
Rs.620
B
Rs.640
C
Rs.660
D
Rs.600
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Solution
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The correct option is DRs.660 Given that conical tent of canvas height is 8m and diameter of base is 12m.
Then, radius of base =122=6m.
Therefore, area of conical tent =πr(√r2+h2)=227×6×√(8)2+(6)2⇒60×227cm2.
If cost of canvas is 3.50 per sq. cm,
then cost of canvas=60×227×3.5=Rs.660.
Hence, option D is correct.
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