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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Why Isn't the Line Moving? – From the Blonde Files

At a store, a Blonde lady stood in line waiting to pay for her items.
Three men stood before her in the line. After 15 minutes she realized that the line wasn't moving at all.
She shouted at the cashier, 'Is this line going to take all day long?'
The cashier replied, 'Please step aside ma'am and come here. You are standing behind three mannequins.'

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Guillaume Amontons

Died 11 Oct 1705 at age 42 (born 31 Aug 1663).French physicist who developed the air thermometer - which relies on increase in volume of a gas (rather than a liquid) with temperature - and used it (1702) to measure change in temperature in terms of a proportional change in pressure. This observation led to the concept of absolute zero in the19th century. Deaf since childhood, Amontons worked on inventions for the deaf, such as the first telegraph, which relied on a telescope, light, and several stations to transmit information over large distances. Amontons' laws of friction, relied upon by engineers for 300 years, state that the frictional force on a body sliding over a surface is proportional to the load that presses them together and is also independent of the areas of the surfaces.
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