Inspiring Mathematicians

Pythagoras (circa 570-495BC)

Vegetarian mystical leader and number-obsessive, he owes his standing as the most famous name in maths due to a theorem about right-angled triangles, although it now appears it probably predated him. He lived in a community where numbers were venerated as much for their spiritual qualities as for their mathematical ones. His elevation of numbers as the essence of the world made him the towering primogenitor of Greek mathematics, essentially the beginning of mathematics as we know it now. And, famously, he didn't eat beans.

Girolamo Cardano (1501 -1576)

Girolamo Cardano (1501-1576), mathematician, astrologer and physician. Photograph: SSPL/Getty

Italian polymath for whom the term Renaissance man could have been invented. A doctor by profession, he was the author of 131 books. He was also a compulsive gambler. It was this last habit that led him to the first scientific analysis of probability. He realised he could win more on the dicing table if he expressed the likelihood of chance events using numbers. This was a revolutionary idea, and it led to probability theory, which in turn led to the birth of statistics, marketing, the insurance industry and the weather forecast.

Taken from......

https://www.theguardian.com/culture/2010/apr/11/the-10-best-mathematicians

World Maths Day:

20 Interesting and Amazing Facts

About Maths Posted By: Ambika Updated: Thursday, October 15, 2015, 13:03 [IST]

                     Words such as formula, equation and calculation sounds boring for those who hate Maths as a subject, whereas it is fun for those who have keen interest towards solving equations/problems.October 14th is celebrated as World Maths Day. Let us know some interesting and amazing facts about Mathematics.

1. Zero ( 0 ) is the only number which can not be represented by Roman numerals.

2. What comes after a million, billion and trillion? A quadrillion, quintillion, sextillion, septillion, octillion, nonillion, decillion and undecillion

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

4. 2 and 5 are the only primes that end in 2 or 5

5. An icosagon is a shape with 20 sides

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

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

8. 40 when written "forty" is the only number with letters in alphabetical order, while "one" is the only one with letters in reverse order

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

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

11. 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.

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

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

14. Abacus is considered the origin of the calculator

15. 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)

16. 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).

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

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

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

20. 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

Read more at: https://www.careerindia.com/news/20-interesting-amazing-facts-about-maths-015921.html

SPEED MULTIPLYING WITH 21, 31, 41........

To multiply by 21:   Double the number, then multiply by 10, and add the original number.

for example,  to multiply 42 by 21,

      Double 42 yields 84,  when we multiply it with 10 we get 840, and then add the original number 42 we get 882.

To multiply with 31:  Triple the number, then multiply with 10, and add the original number.

For example, to multiply 17 by 31,

       triple of 17 is 51, multiplying 41 by 10 we get 510, and we get 527 when we add 17- the original number with 510.  

To multiply by 41: Quadruple the number, then multiply by 10, and add the original number          

very useful in practical life which I found in the 8th standard text book.....

• Find the area of the coloured region.

SOLUTION:

Given:        radius of the quadrant of a circle =  3 cm

                   Length of the rectangle               = 15 cm

                   Breadth of the rectangle              =  8  cm

to find:       Area of the coloured region        = Area of the rectangle - area of the four quadrants    of

                                                                                                                a circle

                                                                       

                                                                       = b × h sq.units  -  4 × (1/4 ×πr² )   

                                                                       = (15×8)   - (22/7 × 3 × 3)

                                                                       = 120 -28.29

                                                                       = 91.714 cm ²

^{Area of the coloured region =} 91.714 cm ²