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Find the area of the black region

Find the area of the black region accurate up to 3 decimal places. (A=?, a=20, b=10)

Correct answers: 39

The first user who solved this task is Sanja Šabović.

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One man said to the other...

One man said to the other, "You know, there are really only three kinds of people in the world: those who can count, and those who can't.

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Maria Gaetana Agnesi

Born 16 May 1718; died 9 Jan 1799 at age 80.Italian mathematician and philosopher who was the first woman in the Western world considered to be a mathematician. In Propositiones Philosophicae (1738) she presented a series of essays on philosophy and natural science that she had defended in discourses with invited intellectuals who were invited her father's home. In 1748, her two volumes of Analytical Institutions, were acclaimed by the academic world as one of the first and complete publications that brought together the works of various mathematicians on finite and infinitesimal analysis. After the death of her father in 1752, Agnesi entirely devoted herself and spent her money to do charitable work. She died in total poverty in the poorhouse of which she had been the director.

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