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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A man is in his front yard att...

A man is in his front yard attempting to flya kite with his son. However, every time thekite gets up into the air, it comes crashingback down.
This goes on for a while, when his wife sticksher head out of the front door and yells, "Youneed more tail."
The father turns to his son and says, "Son,I'll never understand your mother. Yesterday,I told her I needed more tail, and she told meto go fly a kite!"
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Electric race-track amusement patent

In 1899, black American inventor, Granville T. Woods was issued a U.S. patent for an "Amusement Apparatus" (No. 639,692). Woods, as the most prolific African-American inventor of the late 19th and early 20th centuries, has been called the black Edison. His numerous inventions included a steam-boiler furnace, telephone, telegraph system, electric railway and automatic air brake for railroad safety. This patent design was for small scale or large scale electrically-driven cars on a closed track, such as a figure-8 layout . If carrying persons, Woods claimed that it was suitable for amusement "use at summer and other resorts, at fairs, &c., and in or out of doors." The track could cross at different levels, or on the same level.«
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