MathDB
folding a parallelogram, a regular pentagon is constructed, find angles

Source:

May 11, 2019
geometryparallelogrampentagonangles

Problem Statement

In a parallelogram ABCDABCD , BDBD is the largest diagonal. By matching BB with DD by a bend, a regular pentagon is formed. Calculate the measures of the angles formed by the diagonal BDBD with each of the sides of the parallelogram.