The rolling mill

A rectangle with a semicircle, a quarter circle and a common tangent. What fraction is blue?

Scroll down for a solution to this problem.


The blue fraction is π√3/8, which is approximately 68%.

Solution by Dr Rick.


Rolling mill for metal industry
Producing special kinds of sheets as lead mainly.
The work is done rudimentary
By “the sheep” a rolling mill, mostly
Some processes are separated physically
With it’s capacity
It’s an important part of the economy
In most countries so Germany


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