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The angle of a sector of a circle with radius 42cm is 120 degree.if the sector is cut out and used to make a cone,what is the curved surface area of the cone?

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  1. So in effect the third of our circle becomes the curved surface area of the cone
    ( 120° = (1/3) of 360°)

    area = (1/3)π 42^2 = 588π cm^2

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