A solid wooden cone of diameter 14 cm and vertical lenghy 24 m cut into two halves one hlaf is to be covered by colour ful paper at the rate of rs 7 find the total cost of paper required
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Answer:
radius = diameter/2=7cm
Slant height(l)=√{(vertical ht)^2+radius^2}
=√(24^2+7^2)
=25cm.
Total surface area of cone=πr(l+r)
=22/7(25+7)cm^2
=864/7cm^2
Thus total surface area of each half = (864/7)/2+area of the triangle at the axis along which it is cut
= 864/14
=864/14+84
=1176/14
rate=Rs.7
the cost= 1176*7/14
=Rs.588
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