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Little explorations with HP calculators (no Prime)
03-29-2017, 06:15 PM
Post: #71
RE: Little explorations with the HP calculators
(03-29-2017 11:49 AM)pier4r Wrote:  
(03-29-2017 11:31 AM)Han Wrote:  Have you considered the sum of the angles in a triangle and a quadrilateral, and properties of vertical angles?

Yes I considered the angles in a triangle (180) and quadrilateral (360), I considered that an angle is the same when opposite or the complementary that have a sum of 180. Unless I missed some internal shape, I got all the possibilities of which I'm aware of.

What I did see after your question is the concave pentagon. And maybe this will help.


So \(\angle BED\) , \(\angle BDE \), \( \angle CDE \) and \( \angle AED \) should be the only angles whose measure you cannot determine directly from the properties mentioned. What if you set up an appropriate system of equations involving these angles?

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RE: Little explorations with the HP calculators - Han - 03-29-2017 06:15 PM



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