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Little explorations with HP calculators (no Prime)
04-06-2017, 12:47 AM (This post was last modified: 04-07-2017 08:22 PM by SlideRule.)
Post: #121
RE: Little explorations with the HP calculators
... I share one solution ...

Here's my solution to post #67, page 4, Triangle Problem.

∠EDC = 180° - (∠D + 48°) ≊ 81°
where
∠D = acos[(ED² + BD² - BE²)/(2·ED·BD)] ≊ 51° S-S-S equation
BE = sin(84°)/sin(18°) - sin(63°)/sin(39°) ≊ 1.802517077
ED = BE² + BD² - (2·BE·BD·cos18°) ≊ 0.7167358991 S-A-S equation
BD = sin(78°)/sin(18°) - AD ≊ 2.165352128
AD = 1

BEST!
SlideRule

ps: hopefully, NO typos!
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RE: Little explorations with the HP calculators - SlideRule - 04-06-2017 12:47 AM



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