Find the area of the black region
[2917] Find the area of the black region - Find the area of the black region accurate up to 3 decimal places. (A=?, a=20, b=10) - #brainteasers #math #riddles - Correct Answers: 39 - The first user who solved this task is Sanja Šabović
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Find the area of the black region

Find the area of the black region accurate up to 3 decimal places. (A=?, a=20, b=10)
Correct answers: 39
The first user who solved this task is Sanja Šabović.
#brainteasers #math #riddles
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Ponderings Collection 30

If the black box flight recorder is never damaged during a plane crash, why isn't the whole airplane made out of the same stuff?
Why is there an expiration date on sour cream?
If most car accidents occur within five miles of home, why doesn't everyone just move 10 miles away?
If man evolved from monkeys and apes, why do we still have monkeys and apes?
I went to a bookstore and asked the saleswoman, "Where's the self-help section? She said if she told me, it would defeat the purpose.
If all those psychics know the winning lottery numbers, why are they all still working?
Why do we say something is out of whack? What is a whack?
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Steam pump

In 1844, Henry Rossiter Worthington (b. 17 Dec 1817, d. 17 Dec 1880) patented the independent single direct-acting steam power pump, an invention which laid the foundation of the entire pump industry. He was a U.S. mechanical engineer, and this invention solved the major steam-engine problem of supplying water to the boiler - even when the engine was shut down - and replaced hand-pumping to keep the boiler filled. He had several inventions leading to the perfection of the direct-acting steam power pump (1845-55), patented the duplex steam pump (1859), and built the first duplex waterworks engine, widely adopted and used for more than 75 years. He established a pump manufacturing plant, New York City, in 1859.
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