Answer to Question #311973 in Geometry for Thenjiwe

Question #311973

A cone made of paper is used to drink water from. It is made from circular paper with a radius of 12 cm, with a sector of 120° cut out. Calculate the area of paper needed to make the cone cup.

Expert's answer

$A=\pi r^2\frac{360-120}{360}=\pi 12^2*\frac{2}{3}=96\pi=301.59cm^2.$

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