relation between the formula for area of sector of a circle and the curved surface area of a cone.

it should be in steps..
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1 Answer

yukan make a kone bi kut paper, bend & glue it tugether

2 strate sides like part av triangel, then bottom=ark av a serkel

Smaller angel at top=kone sharper

Leng av kerved part=rim-leng av base av kone
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