Rectangular sheet of paper ABCD is folded as shown in the figure. Find the rato DK:AB, given that C1 is the midpoint of AD.
Problem
Source: V.A. Yasinsky Geometry Olympiad 2017 VIII-IX p1 [Ukrane]
Tags: geometry, rectangle, ratio
Source: V.A. Yasinsky Geometry Olympiad 2017 VIII-IX p1 [Ukrane]
Tags: geometry, rectangle, ratio
Rectangular sheet of paper ABCD is folded as shown in the figure. Find the rato DK:AB, given that C1 is the midpoint of AD.