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Maths wizards! How to find the area of an eliptical section?

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Old 22 July 2002, 11:19 AM
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Mick
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And if someone would like to give the Excel code as well that would be fandabidosi

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Old 22 July 2002, 11:41 AM
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carl
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What do you mean by 'elliptical section'? Do you mean 'how to find the area of an ellipse' (which happens to be a 'conic section')?
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Old 22 July 2002, 12:28 PM
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The area of an oval is the length (L) multiplied by the width (W), multiplied by 0.8.

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Old 22 July 2002, 12:41 PM
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A bit approximate. It's actually pi*a*b where a is the semimajor axis and b is the semiminor axis. In this case your L is 2a and your W is 2b, so it's actually (pi/4)*L*W. And of course (pi/4) is not really 0.8
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Old 22 July 2002, 12:48 PM
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Okay, so its actually 0.785398163397448 but whos counting
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Old 22 July 2002, 01:23 PM
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Dunk, no it's not :P
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Old 22 July 2002, 01:27 PM
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Come on then Chiark, you going to give the full calculation ?
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Old 22 July 2002, 01:29 PM
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carl
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Full calculation and derivation here
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Old 22 July 2002, 01:47 PM
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LOL Glad we sorted that one then
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Old 22 July 2002, 01:55 PM
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Mick
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Thanks guys - it soooooo good to have someone to rely on

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Old 24 July 2002, 10:39 PM
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OK then... what about an oval formed by a minor and major rad, with a given length and width? (it seems our 'elliptical sections' are not actually true ellipses after all )

Can you do that one? eh? eh?

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Old 25 July 2002, 09:08 AM
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how long is a Chinese piece of string
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Old 25 July 2002, 10:07 AM
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Lee... 6m 25 cm

Why you ask?, why you interested? Is 'Lee' you first name or you second name ?
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Old 25 July 2002, 10:13 AM
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Warning.... incoming muppetisation.

I always thought that the answer was "twice half it's length". Enough!
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