Math facts

Did you know that...

1. π=3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 58209 74944 59230 78164 06286 20899 86280 34825 34211 70679 82148 08651 32823 ...
2. A sphere has two sides. However, there are one-sided surfaces.
3. There are shapes of constant width other than the circle. One can even drill square holes.
4. There are just five regular polyhedra
5. In a group of 23 people, at least two have the same birthday with the probability greater than 1/2
6. Everything you can do with a ruler and a compass you can do with the compass alone
7. Among all shapes with the same perimeter a circle has the largest area.
8. There are curves that fill a plane without holes
9. Much as with people, there are irrational, perfect, complex numbers
10. As in philosophy, there are transcendental numbers
11. As in the art, there are imaginary and surreal numbers
12. A straight line has dimension 1, a plane - 2. Fractals have mostly fractional dimension
13. You are wrong if you think Mathematics is not fun
14. Mathematics studies neighborhoods, groups and free groups, rings, ideals, holes, poles and removable poles, trees, growth ...
15. Mathematics also studies models, shapes, curves, cardinals, similarity, consistency, completeness,space ...
16. Among objects of mathematical study are heredity, continuity, jumps, infinity, infinitesimals,paradoxes...
17. Last but not the least, Mathematics studies stability, projections and values, values are often absolute but may also be extreme, local or global.
18. Trigonometry aside, Mathematics comprises fields like Game Theory, Braids Theory, Knot Theoryand more
19. One is morally obligated not to do anything impossible
20. Some numbers are square, yet others are triangular
21. The next sentence is true but you must not believe it
22. The previous sentence was false
23. 12+3-4+5+67+8+9=100 and there exists at least one other representation of 100 with 9 digits in the right order and math operations in between
24. One can cut a pie into 8 pieces with three movements
25. Program=Algorithms+Data Structures
26. There is something the dead eat but if the living eat it, they die.
27. A clock never showing right time might be preferable to the one showing right time twice a day
28. Among all shapes with the same area circle has the shortest perimeter

Important history and facts:

• Do you know the magic of no. nine (9)? Multiply any number with nine (9 ) and then sum all individual digits of the result (product) to make it single digit, the sum of all these individual digits would always be nine (9).

• Here is an interesting trick to check divisibility of any number by number 3.A number is divisible by three if the sum of its digits is divisible by three (3).

• The = sign ("equals sign") was invented by 16th Century Welsh mathematician Robert Recorde, who was fed up with writing "is equal to" in his equations.

• Googol (meaning & origin of Google brand ) is the term used for a number 1 followed by 100 zeros and that it was used by a nine-year old, Milton Sirotta, in 1940.

• The name of the popular search engine ‘Google’ came from a misspelling of the word ‘googol’.

• Abacus is considered the origin of the calculator.

• Have you ever noticed that the opposite sides a die always add up to seven (7).

• Equal sign (=) was first used in 1557 by Robert Recorde, an Englishman.

• 12,345,678,987,654,321 is the product of 111,111,111 x 111,111,111. Notice the sequence of the numbers 1 to 9 and back to 1.

• Plus (+) and Minus (-) sign symbols were used as early as 1489 A.D.

• An icosagon is a shape with 20 sides.

• Trigonometry is the study of the relationship between the angles of triangles and their sides.

• If you add up the numbers 1-100 consecutively (1+2+3+4+5...) the total is 5050.

• 2 and 5 are the only primes that end in 2 or 5.

• From 0 to 1,000, the letter "A" only appears in 1,000 ("one thousand").

• A 'jiffy' is an actual unit of time for 1/100th of a second.

• 'FOUR' is the only number in the English language that is spelt with the same number of letters as the number itself

• 40 when written "forty" is the only number with letters in alphabetical order, while "one" is the only one with letters in reverse order.

• In a group of 23 people, at least two have the same birthday with the probability greater than 1/2 .

• If there are 50 students in a class then it's virtually certain that two will share the same birthday..

• Among all shapes with the same perimeter a circle has the largest area.

• Among all shapes with the same area circle has the shortest perimeter .

• In 1995 in Taipei, citizens were allowed to remove ‘4’ from street numbers because it sounded like ‘death’ in Chinese. Many Chinese hospitals do not have a 4th floor.

• The word "FRACTION" derives from the Latin " fractio - to break".

• In working out mathematical equations, the Greek mathematician ,Pythagoreans used little rocks to represent numbers.Hence the name of Calculus was born which means pebbles in Greek.

• In many cultures no 13 is considered unlucky, well,there are many myths around it .One is that In some ancient European religions, there were 12 good gods and one evil god; the evil god was called the 13th god.Other is superstition goes back to the Last Supper. There were 13 people at the meal, including Jesus Christ, and Judas was thought to be the 13th guest.

• Have you heard about Fibonacci? It is the sequence of numbers wherein a number is the result of adding the two numbers before it! Here is an example: 1, 1, 2, 3, 5, 8, 13, 21, 34, and so on

• Want to remember the value of Pi (3.1415926) in easy way ? You can do it by counting each word's letters in 'May I have a large container of coffee?'

• Have you heard about a Palindrome Number? It is a number that reads the same backwards and forward, e.g. 12421.