Question 214783
A  rough  sketch  might  add  to  visual  understanding
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Cone  pointed  down.  Height  is  12 top  dia  is  8.,,,,,,,  7  feet  from  bottom area  is  ?
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8/12 = x/7,,,,,where  x  is  dia 
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cross  multiply,,,12x = 56,,,,,,x=4.67  ft   in  dia
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Area  =  pi*r^2 = pi* 4.67^2 = 68.42 sq ft
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