A paper drinking cup in the shape of a right circular cone is constructed from 125 square centimeters. If the height of the cone is 10 centimeters, find the radius correct to two decimals.
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1 Answer

me take it, yu meen the area av the side av the kone=125

& yu dont overlap the sides (maebee tape edjes tugether)

side area av kone=triangel with base=rim-leng av serkel

triangel base=2pi*radius

triangel side area=(1/2)base*slant-hite=pi*radius*slant-hite

slant hite av kone=sqrt(rad*rad + hite*hite)

slant hite=sqrt(100 + rad*rad)

area=125=sqrt(100+rad*rad)*pi*rad

area/pi=125/pi=rad*sqrt(100+rad*rad)=29.7887382

bi tri & tri agin (iterate) me get rad=2.863758
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