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Find the area of the blue re...

Find the area of the blue region accurate up to 3 decimal places. (A=?, a=1732)

Correct answers: 31

The first user who solved this task is Erkain Mahajanian.

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Automobile patent

In 1879, the first U.S. patent for an automobile was filed by George Baldwin Selden of Rochester, N.Y. It was issued almost two decades later, on 5 Nov 1898 for a unique combination of an internal combustion engine and a road vehicle (No. 549,160).

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