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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Earning His Stripes

A young reporter went to a retirement home to interview an aged but legendary explorer. The reporter asked the old man to tell him the most frightening experience he had ever had. The old explorer looked into the distance and warmed to his task.

“Once, I was hunting Bengal tigers in the jungles of India,” he began: “I was on a narrow path and my faithful native gun bearer was behind me. Suddenly, the largest tiger I've ever seen in my life leaped onto the path in front of us. I turned to get my weapon only to find my gun bearer had fled. The tiger leaped toward me with a mighty ROARRRR! I soiled myself."

“Under those circumstances, sir, I think anyone would have done the same," the reporter said.

The old explorer replied: "No, not then -– just now when I went 'ROARRRR!'”

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Locomotive

In 1948 the first gas-turbine electric locomotive in the U.S. was track-tested in Erie, Pa. Preliminary road tests of the 4800 hp Alco-GE locomotive included hauling of 85 loaded freight cars at speeds as high as 65 mph. In a gas-turbine engine, air is drawn through a compressor into several combustion chambers. Fuel (bunker "C" oil) is injected and the mixture burns, raising the temperature of the compressed air. Resulting gases expand and move at great velocity against the turbine blades, turning the shaft which drives both the power plant compressor and a generator supplying electric power to eight traction motors driving the wheels. The gas-turbine engine was originally designed for aircraft, in which it gives forward thrust from the reaction of its exhaust stream.
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