New posts in Polygons

Comparing between regular polygons

If $AB\parallel DC$, $BC\parallel AD$, and $AC\parallel DQ$, find $\Bbb X$ in terms of the areas $\Bbb A$, $\Bbb B$, and $\Bbb C$.

Convex polygons that do not tile the plane individually, but together they do

Extending the Law of Cosines formula to quadrilaterals (and even polygon?)

Convex cyclic hexagon $ABCDEF$. Prove $AC \cdot BD \cdot CE \cdot DF \cdot AE \cdot BF \geq 27 AB \cdot BC \cdot CD \cdot DE \cdot EF \cdot FA$

Find the maximum number of triangles that can have equal area

Are functions that sum to zero over vertices of similar polygons identically zero?

Simson line in the regular 17-gon

If a regular polygon has a fixed edge length, can I know how many edges it has by knowing the length from corner to its center?

proving that the area of a 2016 sided polygon is an even integer