a cap is shaped like the frustum of a cone. if its radius on the open side is 10cm and the radius of the upper base is 4cm and its slant height is 15cm, find the area of cloth for making it.
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Answered by
9
Radius (R) of the upper circular= 4 cm
Radius (r) of the lower circular = 10 cm
so, according to the formula =π(R+r)l + πr^2 = π(10 + 4) 15 + π(4)2= π(14) 15 + 16π
= 210π + 16π = (266x22)/7= 710.28cm^2
Radius (r) of the lower circular = 10 cm
so, according to the formula =π(R+r)l + πr^2 = π(10 + 4) 15 + π(4)2= π(14) 15 + 16π
= 210π + 16π = (266x22)/7= 710.28cm^2
Answered by
6
=22/7*(10+4)15+22/7*4*4
=352*2*15+352/7
=660+352/7
=660+50.28
=710.28
plz refer to RD sharma page no. 16.75
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