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* ''A'' dan ''B'' adalah [[Sudut#Sudut komplementer|komplementer]].<ref>{{Cite web |url=http://www.ricksmath.com/right-triangles.html |title=Properties of Right Triangles |access-date=2020-06-02 |archive-date=2011-12-31 |archive-url=https://web.archive.org/web/20111231222001/http://www.ricksmath.com/right-triangles.html |dead-url=yes }}</ref>
* <math>\displaystyle \cos{A}\cos{B}\cos{C}=0.</math><ref name="Andreescu3" /><ref name="CTK">CTK Wiki Math, ''A Variant of the Pythagorean Theorem'', 2011, [http://www.cut-the-knot.org/wiki-math/index.php?n=Trigonometry.AVariantOfPythagoreanTheorem] {{Webarchive|url=https://web.archive.org/web/20130805051705/http://www.cut-the-knot.org/wiki-math/index.php?n=Trigonometry.AVariantOfPythagoreanTheorem |date=2013-08-05 }}.</ref>
* <math>\displaystyle \sin^2{A}+\sin^2{B}+\sin^2{C}=2.</math><ref name="Andreescu3" /><ref name="CTK" />
* <math>\displaystyle \cos^2{A}+\cos^2{B}+\cos^2{C}=1.</math><ref name="CTK" />