area by 2 congrurent rectangles (2021 Novosibirsk Oral Geo Oly 7.7)
Source:
April 27, 2021
geometryrectangle
Problem Statement
Two congruent rectangles are located as shown in the figure. Find the area of the shaded part.
https://cdn.artofproblemsolving.com/attachments/2/e/10b164535ab5b3a3b98ce1a0b84892cd11d76f.png