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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Whiffle ball inventedIn 1953, the whiffle ball, a ball that curved when it was thrown, was invented by David Mullany Sr. for his 13-year-old son. |