Find the area of the green regionFind the area of the green region if area of blue square is 1389. Express result to the accuracy of 3 decimal.
Correct answers: 23
The first user who solved this task is Sanja Šabović.
Brass spinning patentIn 1851, the first U.S. patent for brass spinning was issued to H.W. Hayden in Waterbury, Connecticut (No. 8589). His invention was for machinery that could make kettles and similar articles from discs of metal. A disc was mounted in a chuck that rotated at a uniform speed. A tool then pressed against the metal and shaped it to a die.