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Find the area of the green region

Find the area of the green region if area of blue square is 1389. Express result to the accuracy of 3 decimal.

Correct answers: 24

The first user who solved this task is Sanja Šabović.

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Johann Wilhelm Ritter

Died 23 Jan 1810 at age 33 (born 16 Dec 1776).German physicist who discovered the ultraviolet region of the spectrum (1801) and thus helped broaden man's view beyond the narrow region of visible light to encompass the entire electromagnetic spectrum from the shortest gamma rays to the longest radio waves. After studying Herschel's discovery of infrared radiation, he observed the effects of solar radiation on silver salts and deduced the existence of radiation outside the visible spectrum. He also made contributions to spectroscopy and the study of electricity.

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