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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Would you like me to be your friend?

Kathy began a job as an elementary school counselor and she was eager to help.

One day, during recess, Kathy noticed a young girl standing by herself on one side of the playing field while the rest of the kids were playing a game of soccer.

A while later, Kathy walked over to the young girl and offered, "Would you like me to be your friend?"

The girl looked at Kathy suspiciously, then said hesitantly, "Okay, I guess so..."

"Why are you standing here all alone?" asked Kathy.

"Because," the little girl said with great exasperation, "I'm the goalie!"

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Station indicator

In 1893,a patent for a "Station Indicator" was granted to the black American inventor Thomas W. Stewart with William E. Johnson, of which they assigned a half interest to Levi and Albert Johnson, all of Detroit, Michigan (U.S. No. 499,895). The invention was for use in railway and street cars to indicate the different stations and streets the car is approaching. It was to automatically advance a belt of sign cards displaying the names of the stations and streets. This advance was activated by a lever on the outside of the car coming into contact with an inclined projection beside the track. An alarm would also sound. Another lever allowed the vehicle operator to reverse the movement of the belt for the return journey.
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