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Paige is throwing a birthday party and wants to make cone shaped party hats. She wants the radius of the hat to be 12cm and the height to be 28cm. How much paper does she need to make 4 hats? (Note: the bottom of the hats will not be covered.)

 Jun 7, 2021
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Find slant height via pythagorean theorem =

    sqrt ( 28^2 + 12^2) = 30.46 cm

 

slant height *  height * pi = lateral surface area

     30.46   * 28    * pi              and we need 4 of these

 

30.46 * 28 * pi * 4 = 10718.7  cm^2     = 1.072 m2  

 Jun 7, 2021

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