Pi approximation Day

1. Pi Approximation Day is celebrated specially in the region follows date/month format on-

2. Region follows the month /day format , celebrates the Pi Day on -

3. Pi denotes the relation between -

4. The value of the Pi denotes approximately -

5. Pi is a-

6. Pi is also sometimes called ' Archimedes Constant' because in around 250 BC the Greek mathematician Archimedes calculated the value of Pi with-

7. Indian mathematician Madhava used which procedure to estimate Pi  to 11 digits around 1400 AD ?

8. The Greek letter of this image was used for the first time to represent the ratio between a circle's circumference and diameter in 1706 by -