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

You may use the detail view below to convince yourself of the triangle similarity.

## 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