anonymous
  • anonymous
how do i find the surface area of a right cone? with the measurements of 5ft as the radus and 12ft as a hight
Mathematics
schrodinger
  • schrodinger
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amistre64
  • amistre64
do we include the base area?
amistre64
  • amistre64
if you cut the cone up its length and splay it out; we get a part of a circle; with radius 12 and arc length of 5
amistre64
  • amistre64
the total area of the circle would be 2pi(12) = 24pi 24pi/5 is the length of the arc area of a sector is: (radian angle)r^2/2

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anonymous
  • anonymous
thank you
amistre64
  • amistre64
arc length = angle(r) 5 = angle(12) angle = 5/12 ; in radians 5(12)^2 area = ------- = 5(6) = 30 if I did it right :) 12*2
amistre64
  • amistre64
if that includes that area of the base then add on another 25pi
anonymous
  • anonymous
thanks

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