Circumference of an ellipse

[pango]

Keplerian or 'optimised equivalent-radius' method?

[DimPrawn]

How do you know you've "done"?

A bit like:

Q

"Where in a ship do they always put the last rivet?"

A

"In the last hole"

HTH

[richard-af]

Pi x diameter.

I did get a "D" for maths.

[King Cnvt]

What's the diameter of an ellipse?

[AlfredJPruffock]

What's the diameter of an ellipse?

The same as the Width Of A Circle ...


In the corner of the morning in the past -
I would sit and blame The Master first and last

All the roads were straight and narrow
And the prayers were small and yellow
And the rumour spread that I was aging fast

Then I ran across a monster who was sleeping by a tree.
And I looked and frowned and the monster was me

So I cried for all the others till the day was nearly through
For I realized that God's a young man too

So I said "So long" and I waved "Bye-bye"
And I smashed my soul and traded my mind

And the moral of this magic spell
Negotiates my hide
When God did take my logic for a ride

[wendigo100]

Define an ellipse.

[richard-af]

What's the diameter of an ellipse?

The sum of the squares on the other two sides?

[richard-af]

Ellipse: The fleshy mouth parts covering the teeth of an eel.

[BrilloPad]

Let me rephrase the question. If a and b are the minor and major radius, can anyone integrate (over theta from 0 to 2*pi) :-

srqt( (a*sin(theta)) ^2 + (b*cos(theta)) ^2 )

[wobbegong]

This contains formulae and some Java code to plot it

wobb in <not something I've ever had to do (thank God)> mode.