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Little explorations with HP calculators (no Prime)
03-25-2017, 08:17 AM (This post was last modified: 03-25-2017 08:19 AM by pier4r.)
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RE: Little explorations with the HP calculators
(03-24-2017 10:54 PM)Dieter Wrote:  I think a calculator is the very last thing required here.

As always, first comes the mental work to create the formula or the model, but to compute the final number one needs a calculator most of the time.

Quote:Numeric solver? The radius can be determined with a simple closed form solution. Take a look at the diagonal through B, O and D which is 6√2 units long.
So 6√2 = 2√2 + r + r√2. Which directly leads to r = 4 / (1 + 1/√2) = 2,343...

I used the numeric solver because instead of grouping r on the left, I just used the formula of one step before - the one without grouping - to find the value. Anyway one cannot just use the diagonal because the picture is well done, one has to prove to himself that O is on the diagonal (nothing difficult, but required), otherwise it may be a step taken for granted.

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RE: Little explorations with the HP calculators - pier4r - 03-25-2017 08:17 AM

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