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
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Chenille manufacturing machine patentedIn 1863, the first U.S. patent for a chenille manufacturing machine was issued to William Canter of New York City, who made the first such machine in the U.S. (No. 37,415) |