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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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Marriage counselor

Husband to counselor: We were very happy for 22 years.

Counselor: What happened?

Husband: We got married.

Counselor, turning to wife: Do you agree with your husband's assessment of your marriage?

Wife: Yes, the only thing my husband and I have in common is that we were married on the same day.

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Dirk Brouwer

Died 31 Jan 1966 at age 63 (born 1 Sep 1902).Dutch-American astronomer and geophysicist known for his achievements in celestial mechanics, especially for his pioneering application of high-speed digital computers for astronomical computations. While still a student he determined the mass of Titan from its influence on other Saturnian moons. Brouwer developed general methods for finding orbits and computing errors and applied these methods to comets, asteroids, and planets. He computed the orbits of the first artificial satellites and from them obtained increased knowledge of the figure of the earth. His book, Methods of Celestial Mechanics, taught a generation of celestial mechanicians. He also redetermined astronomical constants.

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