Author Topic: Arc  (Read 587 times)

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ronjonp

  • Needs a day job
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Re: Arc
« Reply #15 on: December 03, 2017, 09:25:58 am »
@Ron, just curious, why the (42 . 4)?
I just used Charle's entmake function. No rhyme or reason other than that 😁
« Last Edit: December 03, 2017, 04:20:31 pm by ronjonp »

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Lee Mac

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Re: Arc
« Reply #16 on: December 03, 2017, 09:52:21 am »
The complement bulge is the inverse number (1 / bulge)

Thanks gile, I hadn't considered that tan((2pi-x)/4) = cot(x/4), that's a nice property.

gile

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Re: Arc
« Reply #17 on: December 03, 2017, 01:40:29 pm »
The complement bulge is the inverse number (1 / bulge)

Thanks gile, I hadn't considered that tan((2pi-x)/4) = cot(x/4), that's a nice property.

More generally:
cotan(a) = tan(pi/2 - a)
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