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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Skinny Dippers

Ron, an elderly man in Australia, had owned a large farm for several years. He had a large pond at the back.
It was properly shaped for swimming, so he fixed it up nice with picnic tables, horseshoe courts, and some orange and lime trees.

One evening the old farmer decided to go down to the pond, as he hadn't been there for a while, and look it over.
He grabbed a five-gallon bucket to bring back some fruit. As he neared the pond, he heard voices shouting and laughing with glee.

As he came closer, he saw it was a bunch of young women skinny-dipping in his pond. He made the women aware of his presence, and they all went to the deep end.
One of the women shouted to him, "We're not coming out until you leave!"

Ron frowned, "I didn't come down here to watch you ladies swim naked or make you get out of the pond naked."
Holding the bucket up Ron said, "I'm here to feed the alligator."

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Robert Livingston Stevens

Born 18 Oct 1787; died 20 Apr 1856 at age 68.U.S. engineer and ship designer who invented the inverted-T railroad rail and the railroad spike. He tested the first steamboat to use screw propellers, invented and built by his father, John Stevens. Robert designed the first concave waterlines on a steamboat (1808), the first supporting iron rods for projecting guard beams on steamboats (1815), the first skeleton walking beams for ferries (1822), the spring pile ferry slip (1822), the placement of boilers on guards outside the paddle wheels of ferries (1822), the hog frame or truss for stiffening ferry boats longitudinally (1827), spring steel bearings of paddle wheel shafts (1828), improved packing for pistons (1840), and was first to successfully burn anthracite coal in a cupola furnace (1818). He found that rails laid on wooden ties, with crushed stone or gravel beneath, provided a roadbed superior to any known before. His rail and roadbed came into universal use in the United States. He also added the pilot, or cowcatcher, to the locomotive and increased the number of drive wheels to eight for better traction.
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