raiders5091
raiders5091 raiders5091
  • 21-05-2018
  • Mathematics
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what is the total surface area of the cone?

what is the total surface area of the cone class=

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calculista
calculista calculista
  • 30-05-2018
we know that
surface area of the cone=pi*r²+pi*r*l
r=5 cm
l is the slant height

l²=12²+5²-----> l²=169--------> l=13 cm
surface area of the cone=pi*5²+pi*5*13----> [25*pi+65*pi]----> 90*pi cm²

the answer is
90*pi cm² or 282.6 cm²
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