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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Wandering Dog

An old, tired-looking dog wandered into the yard. I could tell from his collar and well-fed belly that he had a home.
He followed me into the house, down the hall, and fell asleep on the couch. An hour later, he went to the door, and I let him out. The next day he was back, resumed his position on the couch and slept for an hour. This continued for several weeks. Curious, I pinned a note to his collar: 'Every afternoon your dog comes to my house for a nap.'

The next day he arrived with a different note pinned to his collar: 'He lives in a home with four children -- he's trying to catch up on his sleep. Can I come with him tomorrow?'

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Donald Culross Peattie

Born 21 Jun 1898; died 16 Nov 1964 at age 66. American botanist, naturalist and author who won high critical acclaim for his several books on plant life and nature. After college, he joined the U.S. Department of Agriculture as a botanist in the office of foreign seed and plant introduction. From 1922-3 he worked on frost resistance in tropical plants. In 1926, he left the USDA to free-lance in his own field, writing books and also began a nature column in the Washington Star which ran for 10 years. An example of his writing for lay people, his book Flowering Earth (1939, reprinted 1991) reveals the miracle of plant life. Needing no chemical formulas or botanical glossary, it involves the reader in the vital stories of chlorophyll and of protoplasm, of algae and seaweeds, conifers and cycads.
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