# WHAT IS PI DAY?

## WHAT IS PI DAY – PI DAY = 3.14159265359…

PI DAY = 3.14159265359…

Pi day is an annual celebration which is celebrated on the 14th March.

It is observed on this day because this represents (the month/day format = 3/14) and this represents the first 3 significant numbers of pi.

AND ITS EVEN MORE SPECIAL FOR THIS YEAR!!!

If you round the first few digits up of Pi to 5 decimal places, it actually gives you 3.14.16 (third month/date/year). = 3.14159 = 3.1416

## WHAT IS PI?

Pi is calculated to over one trillion digits beyond its decimal point.

Pi is used in mathematics to represent a “constant” (the ratio of the circumference of a circle to its diameter).

A diameter of a circle is the distance from one edge to the other edge which is measured straight through the centre of the circle.

The circumference of a circle is the distance all the way around the circle.

## HISTORY OF PI

• Albert Einstein is born on the 14th March – the same day as Pi day.
• The symbol was first used in 1706.
• The first person to use this symbol was William Jones.
• The symbol is a Greek letter.
• William Jones and his Circle – the man who invented Pi. He come up with the Pi symbol to represent a number that “can be approached, but never reached”.
• The letter ‘P’ was chosen to represent ‘perimeter’.
• Pi is calculated to over one trillion digits.
• Only 39 of the digits are needed to accurately calculate the spherical volume of the universe.

## PI QUESTIONS

The diagram below shows a parallelogram.

The angles in the parallelogram are as follows:

2x + 40

3x – 30

2x + 4

4x – 28

Work out the value of x.