Question

Surface area and volume of a right circular cone
7. The slant height and the diameter of a conical tentare 25 and 14m respec
Calculate the cost of the canvas used at Rs. 15 per sem​

Answer 1

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Cylindrical part: r=2126=63m,h=21−5=16m

l=r2+h2=632+162

=3969+256=4225

∴l=65m

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Total canvas used=CSA of cylindrical part+ CSA of conical part

=2πrh+πrl=2×722×63×5m2+722×63×65m2

=1980m2+12870m2=14850m2

∴ Total canvas used=

Cost of canvas at the rate of Rs. 16per m2=14,850×Rs.15=Rs.2,22,750

∴ Cost of canvas=Rs.2,22,750

$\pink{ hope \: its \: helps \: you!}$