https://math.stackexchange.com/questions/5134032/how-to-construct-the-following-isosceles-trapezoid-with-compass-and-a-straighted
geometry - How to construct the following isosceles trapezoid with compass and a straightedge? -...
Given: $ABCD$ is an isosceles trapezoid with $BC \parallel AD$. $MN$ is a segment such that $M\in AB$, $N\in CD$, $BC\parallel MN\parallel AD$. $AM : MB = DN :...
how tothe followinggeometryconstructtrapezoid
https://www.mathopenref.com/trapezoid.html
Trapezoid - math word definition - Math Open Reference
Trapezoid definition and properties
trapezoidmathworddefinitionopen