Find the area of the shaded region
[2944] Find the area of the shaded region - Find the area of the shaded region accurate up to 3 decimal places. (A=?, r=1389) - #brainteasers #math #riddles - Correct Answers: 39 - The first user who solved this task is Dejan Mratinkovic
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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.
#brainteasers #math #riddles
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The Fourth of July was coming...

The Fourth of July was coming up, and the nursery school teacher took the opportunity to tell her class about patriotism. "We live in a great country," she said. "One of the things we should be happy about is that, in this country, we are all free."
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In 1850, the first U.S. patent for a dishwashing machine was issued to Joel Houghton of Ogden, NY, for an "Improvement in Machines for Washing Table Furniture" (No.7,365). Its design had a cylindrical wire basket to contain the dishes in a tub of boiling water which contained beaters turned by a handle to move the water against the tableware in the basket. The cylinder could also be rotated to expose its contents evenly to the action of the churning water. The first patent on a dishwasher that became commerically successful was issued on 28 Dec1886 to Josephine Cochrane. She began a company supplying her machines to restaurants and hotels, which continued after her death, and years later led to the "KichenAid" brand of home dishwashers.«
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