A metal sheet of breadth 10 cm is used to make a cone of radius 14 cm and slant height 20 cm . then the length of the sheet if 25% is wasted, is ______.
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Step-by-step explanation:
Curved surface area of a cone= πrl
radius=14 cm slant height=20 cm π=22/7 %=25/100
=22/7 x 14 x 20 x 25/100
=22 x 2 x 1 x 25/5
=22 x 2 x 1 x 5
=44 x 5
=220/10
=22 cm
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