Given "int n" number of sides of "double s" length.
(that's an integer number of sides, and all real numbers for side length)

how can I:

calculate r and R? and from that calculate area?

Code:

public double getVertexAngle(); // gets the inner angle of each vertice public double getR() //calculates radius public double getr() //calculates apothem

Ty for any help and just pm me or post here if something doesn't make since and I'll try to explain it better.

Post edited at 3:03 pm on Jan. 6, 2008 by ranman

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If you need any help with any language
especially French, English, or German, let me know...

And I tend to avoid serious topics in which I have nothing meaningful to contribute.

I feel you, though.

It's rare to see a meaningful topic go unspammed by the fresh topic point whores.

I'm actually going to take a shot at solving this.  Any chance you have an example or two for me to check my work against?

You know, for some number of sides n of length s, what would r and R work out to be?

Minimum number of sides?  I'm assuming three.

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Unbelievably awesomesauce to the absurd degree that I wet myself.
Who else has created a LW/magnets
so explicit the mods deleted a screencap of it? =P

those work?

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If you need any help with any language
especially French, English, or German, let me know...

Let's just hope I'll be able to do something with them =P

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Unbelievably awesomesauce to the absurd degree that I wet myself.
Who else has created a LW/magnets
so explicit the mods deleted a screencap of it? =P

Solving for r:

r= s / ( 2 * tan(pi / n) )

or

r= R * cos(pi / n)

R= s / ( 2 * sin(pi / n) )

or

R= r / cos(pi / n)

Area= 0.5 * (r * perimeter)

Can't claim to have picked up on any idea of how any of that works =P

Yay for having completely forgotten geometry?

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Unbelievably awesomesauce to the absurd degree that I wet myself.
Who else has created a LW/magnets
so explicit the mods deleted a screencap of it? =P