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Find the area of the shaded region

Find the area of the shaded region accurate up to 3 decimal places. (A=?, r=1389)

Correct answers: 39

The first user who solved this task is Dejan Mratinkovic.

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You are meant to be together

Sometimes, you find the right person at the wrong time. Sometimes it’s the wrong person at the right time. But when you find the right person, at the right time, in the right situation, it’s because you are meant to be together. Fate has grabbed both of your hands. Don’t let go.

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Railway track scale patent

In 1857, the first U.S. patent for a railway track scale was issued to Thaddeus Fairbanks (No. 16,381). Such a platform scale was introduced by the E. and T. Fairbanks and Company of St. Johnsbury, Vermont. It was designed to weigh railway cars either alone or in train. The platform of the scale was fitted with two rails arranged in line with the railway track such that cars and carriages could readily be rolled on and off. The mechanism beneath was set in a pit. It was constructed with suitable levers and bearings to permit weighing a great range of loads accurately. Thaddeus and his brother built their company's scale business starting over two decades earlier with their invention of a platform scale for merchandise, which they patented 30 Jun 1831.

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