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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Five Englishmen in an Audi Quattro rol...

Five Englishmen in an Audi Quattro roll up to an Irish border checkpoint. Paddy, the officer, halts them and sternly declares, "It's illegal to cram five people into a Quattro. 'Quattro' means four."
The Englishman, incredulous, retorts, "Quattro is just the name of the car! Check the papers: it's designed for five."
"You can't pull that one on me," replies Paddy. "Quattro means four. You've got five folks in there; it's against the law."
The Englishman, now irate, demands, "Get your supervisor! I need someone with more intelligence!"
Paddy quips back, "Sorry, Murphy's tied up with two blokes in a Fiat Uno.
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Dennis Robert Hoagland

Died 5 Sep 1949 at age 65 (born 2 Apr 1884).American plant physiologist who was an authority on plant and soil interactions. He recognized early that the complex problems of soil and plant interrelations must be studied with rigid experimental control and the isolation of individual variables. Thus, he perfected the water-culture technique for growing plants without soil, which nutrient solution is still in plant physiology research. He collected much data on the influence of oxygen, temperature, light, and other factors on ion absorption by roots. In the late 1930's, he adopted radioactive isotopes as tracers. In his fieldwork on soil chemistry he studied zinc, potassium, and phosphate deficiencies of fruit trees in California. He influenced further intensive study of aspects of micronutrients (trace elements).
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