The obstructed view

A rectangle and two squares of side length a and b respectively. What is the red area in terms of a and b?

Scroll down for a solution to this problem.


The red area is a2-b2.

Solution by Herbert Kainberger.


The obstructed view
Just trying to pass through
Pushing the mirror’s view
Going to the other side
To look, to search
The light
So bright
An impression of transparency
To catch a piece of beauty
The skyline is free
The obstruction is ending extraordinarily


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