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Find the area of the blue re...

Find the area of the blue region accurate up to 3 decimal places. (A=?, a=1732)

Correct answers: 31

The first user who solved this task is Erkain Mahajanian.

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Walking with a lantern...

Pappy sees Elmer walking with a lantern and asks, "Where ya going boy?" The son smiled and replied, "I'm a-going courting Peggy-Sue." The Father said, "When I went a-courtin', I didn't need me no dang lantern." "Sure Pa, I know." the boy said. "And look what you got !"

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Johannes Nikolaus Tetens

Born 16 Sep 1736; died 17 Aug 1807 at age 70.German natural philosopher whose empirical approach strongly influenced the work of Immanuel Kant, and later in his life, Tetens became interested in mathematics, especially in actuarial applications. From 1760, as a teacher of natural philosophy he wrote on diverse topics but later began the development of the field of developmental psychology in Germany. He wrote Philosophische Versuche über die menschliche Natur und ihre Entwickelung (1777) on the origin and structure of knowledge. He changed career after 1789 to the civil service during which time he pursued mathematics. As a statistician he produced an Introduction to the Calculation of Life Annuities (1785) and On the Tetens Mortality Curve (1785).«

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