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Find the area of the shaded region

Find the area of the shaded region accurate up to 3 decimal places. (A=?, a=2389, b=1389)

Correct answers: 23

The first user who solved this task is Sanja Šabović.

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Lewis Black: Absolute Faith

You cant deny the faith of these people that we fight: its absolute. They believe that if they kill themselves, theyll be met in heaven with 70-some-odd virgins. Imagine that kind of faith -- to think that that would happen, when I havent met one on earth.

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Charles Sumner Tainter

Born 25 Apr 1854; died 20 Apr 1940 at age 85.American inventor of various sound-recording instruments, including the photophone (1880, with Alexander Graham Bell), an instrument for transmitting sound to a distance through the agency of light, using sensitive selenium cells. He also developed the Graphophone (1881, patented 1886; with Chichester A. Bell, a cousin of Alexander Graham Bell). This greatly improved on the tinfoil surface and rigid stylus then used by Thomas Edison. Tainter devising a wax-coated cardboard cylinder and a flexible recording stylus which incised the grooves (rather than embossing) to achieve better reproduction, making the phonograph and the dictagraph commercially possible.

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