Find the length of red arc AB
Find the length of red arc AB (r1=1, r2=2). Express result to the accuracy of 3 decimal.Correct answers: 43
The first user who solved this task is Roxana zavari.
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Nails patentIn 1795, Jacob Perkins, of Newburyport, Massachusetts, was awarded a U.S. patent for a machine for cutting and heading nails. It was the second year of President George Washington's second term. In 1795, he was issued a patent for an improved nail machine. He established a nail maufacturing business on the Powwow River in Amesbury, Mass. He eventually held 21 American patents, and 19 more in England. |