Why is Pi Day in 2015 so special?
It's a most auspicious holiday for math lovers. Saturday, March 14, 2015 is Pi Day, a celebration of the irrational number that describes the ratio of a circle's diameter to its circumference. Pi is approximately 3.141592653, but it continues at random to infinity.
Pi Day is an annual celebration of the mathematical constant π (pi). Pi Day is observed on March 14 (3/14 in the month/day format) since 3, 1, and 4 are the first three significant digits of π.
- Archimedes of Syracuse
- The record for finding consecutive numbers, from 3.14 onward to the final digit, is held by Fabrice Bellard, who announced in January that he had calculated pi to 2.7 trillion digits.
- Transcript of what is the relationship between the symbol PI and the word. The symbol comes from the Greek alphabet. In mathematical symbol Pi, sometimes written as Pi, is approximately equal to 3.14159.. Pi gets its name from the Greek words for periphery and perimeter, which both begin with the Greek letter, pi.
The concept of pi is important to mathematics because of its relationship to the circle; it is a constant representing the ratio of a circle's circumference to its diameter.
- The digits of pi never repeat because it can be proven that π is an irrational number and irrational numbers don't repeat forever. If you write out the decimal expansion of any irrational number (not just π) you'll find that it never repeats. That means that π is irrational, and that means that π never repeats.
- A chord of a circle is a straight line segment whose endpoints both lie on the circle. A secant line, or just secant, is the infinite line extension of a chord. More generally, a chord is a line segment joining two points on any curve, for instance an ellipse. The word chord is from the Latin chorda meaning bowstring.
- How to find the circumference of a circle:
- The circumference of a circle can be found by multiplying pi ( π = 3.14 ) by the diameter of the circle.
- If a circle has a diameter of 4, its circumference is 3.14*4=12.56.
- If you know the radius, the diameter is twice as large.
Pi Day is celebrated on March 14th (3/14) around the world. Pi (Greek letter “π”) is the symbol used in mathematics to represent a constant — the ratio of the circumference of a circle to its diameter — which is approximately 3.14159.
- A chord that passes through the center of a circle is called a diameter, and is the longest chord.
- A circle is a set of all points in a plane that are all an equal distance from a single point, the center. The distance from a circle's center to a point on the circle is called the radius of the circle. A line segment that crosses the circle by passing through the center of the circle is called the diameter.
- Circles and ovals are both types of ellipses. An 'oval' is really the informal term for an 'ellipse', whereas a 'circle' is an ellipse where the semi-major and semi-minor axes are equal. If you're talking about higher-dimensions, the word you are looking for is probably ellipsoid. (A sphere is an example.)
Updated: 7th December 2019