Two perpendicular lines and a third line. Four circles are tangent to all three lines. Prove that their areas satisfy AB=CD.
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Solution
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Visual solution
Poem
cordon sanitaire
Is typical against many problems
Like racism or
Extreme right
But today
Against the Corona virus
With standard measures
Like testing
Contact tracing
Social distancing
Transmission reducing
To stop covid 19 spreading
Just a barrier
To the spread of anything