math(again)

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the ? says "a cone has the surface area of 160 sq. in. If the dimensions are reduced by 1/2,what is the surface area of the new cone?" i just cant seem to find the formula for the surface area of the cone.

  • math(again) -

    Check this site.

    http://math.about.com/od/formulas/ss/surfaceareavol_2.htm

  • math(again) -

    Surface area cone:

    TOP: 1/2 (circumfirance of bottom x height)
    = 1/2 (PI*radius x height)
    So if you ignore the bottom of the cone, then reducing the dimensions by 1/2...

  • math(again) -

    thanks for helping me

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