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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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Wrong way....

As a older man was driving down the freeway, his car phone rang. Answering, he heard his wife's voice urgently warning him, "Herman, I just heard on the news that there's a car going the wrong way on route 290. Please be careful!"

"Hell," said Herman, "It's not just one car. It's hundreds of them !!!"

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Allan MacLeod Cormack

Born 23 Feb 1924; died 7 May 1998 at age 74. South African-born American physicist who formulated the mathematical algorithms that made possible the development of a powerful new diagnostic technique, the cross-sectional X-ray imaging process known as computerized axial tomography (CAT) scanning. He first described this in two papers in 1963 and 1964. X-ray tomography is a process by which a picture of an imaginary slice through an object (or the human body) is built up from information from detectors rotating around the body. For this work, he was awarded a share (with Sir Gregory Hounsfield) of the 1979 Nobel Prize. Cormack was unusual in the field of Nobel laureates because he never earned a doctorate degree in medicine or any other field of science.

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