Math / Possibly Calculus? Question

Discussion in 'Community' started by yarngrrl, May 18, 2005.

1. yarngrrl macrumors member

Joined:
Apr 26, 2005
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#1
Hopefully some of you smart folks out there can answer this question...

So, let's say you have a cylinder and you cut off the top at a 45 degree angle. How do you calculate the surface area of the oval surface that would remain?

(And, no, this isn't for homework, my father asked me how to do this for a project he's working on, and I'm not sure how to go about it...)

2. AliensAreFuzzy macrumors 68000

Joined:
May 30, 2004
Location:
#2
Use the triangles to figure out the long diameter of the ellipse(diameter of the cylinder * Square root of 2), then use the diameter of the cylinder as the short diameter of the ellipse.

For finding the area of the ellipse:
the area of an ellipse is given by Pi*a*b, where 2*a is the length of the
longer side (measured at its greatest width) and 2*b is the length of
the shortest side (measured at its greatest height).

Joined:
Oct 11, 2004
Location:
Saint Charles, MO
#3
Geometry?

I guess using the triangle and then using that for the oval works... I just finished my Trig final today, so I am tired of anything having to do with "tri."