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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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A Jewish Mother After Hanukkah

A man received two sweaters for Hanukkah from his mother. The next time he visited her, he made sure to wear one of the two sweaters.
As he entered her home, instead of the expected smile, she said, "What's the matter? You didn't like the other one?"

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Frederick Walton

Died 16 May 1928 at age 94 (born 13 Mar 1834).English inventor who invented linoleum (pat. app. 19 Dec 1863, No. 3210). His 88 patents included artificial leather, distillation, plastics, flexible metal tubing, and Lincrusta, an embossed linoleum wall covering (1877). He was a self-described “practical utilitarian of the nineteenth century,” with no education in chemistry or engineering. Before linoleum, he patented (Sep 1861) a varnish applicable to the waterproofing and coating of fabrics. In Jan 1862 he applied with his brother for a patent in which textile card brushes had the short wire bristles held in an india rubber backing. Walton started in the family business of processing India rubber. He developed linoleum from observing the plastic dried surface layer of linseed oil-based paint, which he first investigated as an alternative to rubber and led to linoleum.«

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