A rectangle and two squares of side length a and b respectively. What is the red area in terms of a and b?
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Solution
The red area is a2-b2.

Poem
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
