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anonymous

  • 5 years ago

how do i find the surface area of a right cone? with the measurements of 5ft as the radus and 12ft as a hight

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  1. amistre64
    • 5 years ago
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    do we include the base area?

  2. amistre64
    • 5 years ago
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    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

  3. amistre64
    • 5 years ago
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    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

  4. anonymous
    • 5 years ago
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    thank you

  5. amistre64
    • 5 years ago
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    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

  6. amistre64
    • 5 years ago
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    if that includes that area of the base then add on another 25pi

  7. anonymous
    • 5 years ago
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    thanks

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