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Find the area of the purple shaded region

Find the area of the purple shaded region. Express result to the accuracy of 3 decimal.

Correct answers: 45

The first user who solved this task is Sanja Šabović.

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Hindu Happy Birthday

Q: What does a Hindu wish someone on their birthday?
A: May you have many happy returns.

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Henry Wetherbee Henshaw

Died 1 Aug 1930 at age 80 (born 3 Mar 1850).American naturalist, ornithologist, and ethnologist. From 1872-79, he made annual field trips to various parts of the West as naturalist with the Wheeler Survey, exploring west of the one-hundredth meridian, and prepared reports to Washington. In addition to making a notable collection of birds, he took an interest in other branches of natural history. In 1885 his collection of birds and eggs was acquired by the British Museum. During a period while ornithological work was available, he worked for the Bureau of Ethnology.

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