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Determining the surface area on a 5 sided lunar esque shape

  1. May 6, 2016 #1
    1. The problem statement, all variables and given/known data
    I'm trying to figure out the surface area on a 5 sided shape where the sides can all be modeled by "lunes". The shape will end up looking like a banana peel. We are modeling the sides of the shape as lunes with varying angles on a sphere of radius 3 inches. I'm trying to figure out how I would determine the surface area of the banana peel.

    2. Relevant equations


    3. The attempt at a solution
    Let me begin by saying I am quite confused... I have done a lot of thinking on this problem but seemingly to no avail. If I have 5 sides, could I do a length x width for each side and multiply it by 5? I need one of you genius's on this forum to help me understand what's going on here!
     
  2. jcsd
  3. May 6, 2016 #2

    SteamKing

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    What makes you think that the area of one lune = length multiplied by the width? How closely do your lunes resemble rectangles?
     
  4. May 8, 2016 #3
    Ah, i suppose not very close, was just taking a shot in the dark. Is there a similiar equation for this situation? It must be a bit more complicated because it would include angles and radius of the sphere I suppose.
     
  5. May 8, 2016 #4

    SteamKing

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    It's not clear what this shape looks like, but here is more information on the geometry of spherical lunes:

    https://en.wikipedia.org/wiki/Spherical_lune
     
  6. May 8, 2016 #5
    so the surface area of a spherical lune is given by 2*θ*R^2, and since there are five lunes would it just be this multiplied by 5?
     
  7. May 8, 2016 #6

    SteamKing

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    As long as each lune is identical in having the same angle θ.

    You've never attached a picture of this figure, so I can't say for certain. :frown:
     
  8. May 8, 2016 #7
    a banana peel where each side can be modeled as a lune
     
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