Find the area of the shaded figureExpress result to the accuracy of 3 decimal.
Correct answers: 76
The first user who solved this task is Djordje Timotijevic.
Silence is the best
Silence is the best response to a fool!
The BicycleIn 1819, The first US patent for a velocipede, a predecessor of the bicycle, was issued to William K. Clarkson Jr. of New York. Little information remains available, however, because a fire at the Patent Office in 1836 destroyed the patent record, and it was not restored. The photo shows the Draisine design of the period (Europe, 1816). Bicycles were introduced to the US also in 1819 and were manufactured by David and Rogers in Troy, NY.