Shivani made some conical caps using glossy paper The height and the radius of each cap are 24 cm - Maths - Surface Areas and Volumes

Question

Shivani made some conical caps using glossy paper The height and
the radius of each cap are 24 cm and 10 cm respectively
[Use π = 3 14] If the cost of glossy paper is Rs 6 per 125 cm2,
then what is the approximate cost of making 50 caps?
Options Mark for
review
· A)
Rs 1808
· B)
Rs 1959
· C)
Rs 2016
· D)
Rs 2457

Varun.Rawat · Accepted Answer

We have,radius of base of each conical cap, r = 10 cmheight of each conical cap, h = 24 cmNow, slant height, l = r2+h2 = 100 + 576 = 676 = 26 cmarea of glossy paper used for each cap = πrl = 3
14 × 10 × 26 = 816
4 cm2area of glossy paper used for 50 caps = 50 × 816
4 = 40820 cm2cost of 125 cm2 of glossy paper = Rs 6
00cost of 40820 cm2 of glossy paper = 6125×40820 = Rs 1959
36

Hence the approximate cost is Rs 1959

Hence option (b) is correct