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A bucket is in the form of a frustum of a cone of height 30 cm with radii of its lower and upper ends as 10 cm and 20 cm redpectively.find the capacity and surface area of the bucket . Find the cost of the milk required to completely fill the bucket , at the rate of Rs.25 per litre ( use π =3.14)

Posted by Riya Rao 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 6 years, 10 months ago

capacity or volume of a frustum of a cone is given by

here we have R= 20cm r = 10 cm , h = 30 cm

putting all these values in the volume formula

Now the for the surface area calculate first the slant height l

using Pythagorean theorem as

now surface area is given as

and total surface area is

Now the capacity of the bucket is 22 ltr

so cost of 1 ltr milk is Rs 25 so

cost of 22 Ltr milk will be = 25×22 Rs.

= Rs. 550

2Thank You

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