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Find the area of the shaded figure

Express result to the accuracy of 3 decimal.

Correct answers: 49

The first user who solved this task is Djordje Timotijevic.

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Bowling ball humor

I worry about the germs in the holes of bowling balls. Nobody cleans those holes. There are years of impacted pizza fingers in there. Taco fingers. Chicken fingers. I'm amazed those balls still have holes. Ever smell a bowling ball hole? You think the balls are knocking down the pins? You're wrong. The pins are passing out from the smell.

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Johannes Robert Rydberg

Born 8 Nov 1854; died 28 Dec 1919 at age 65.Swedish physicist, known for the Rydberg constant in his empirical formula that related the wave numbers of the spectral lines of an element (1890). This formula expressed fundamental relationships in those lines, which he presumed were the result of the inner nature and structure of an element's atoms. In 1897, he suggested that an atomic number for each of the elements, rather than atomic weights, would be a better means for organizing the elements and their periodicity of their characteristics. His work did provided the basis for discovering the electron shell structure of the atom. It was later established that the integer number of positive charges on an element's nucleus (its number of protons) corresponded to his idea of atomic number.«

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