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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Richard August carl Emil ErlenmeyerBorn 28 Jun 1825; died 22 Jan 1909 at age 83.German chemist. |