- It is defined as the ratio of a circle's circumference C to its diameter d is called pi.
- It is denoted by symbol π.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhzVifzPXEGnGQoIhoOtH7UJu0xnqIEyvjUGDNzL9x_fjurHdPbgVOnTL_CHi8lHtN2udaPc9RrBxUdAXFHES147CuI9y6CnfvHDqUdEoF-zrGoK3sJRNR4EnaON0A6se6K-gaBICdUW56O/s320/15.jpg)
- But it turns out to be an "irrational number," meaning its exact value is inherently unknowable. Computer scientists have calculated billions of digits of pi, starting with 3.14159265358979323…,
- Pi is often shortened further to 3.14.
Applications of Pi:
- Science: Formulae from other branches of science also include π in some of their important formulae, including sciences such as statistics, fractals, thermodynamics, mechanics, cosmology, number theory, and electromagnetism.
- Trigonometry: It is also used to get the value of trigonometry function like sine, cosine, tangent...etc. It can measure circular velocity of things like truck wheel, motor shafts, engine parts, gears.
- Geometrical designs: Calculation of surface area, volume of curved objects i.e- Cylinder, Cone, Sphere etc, like calculation of area & volume of machine parts requires Pi. Designing of bridges, highway curves requires Pi.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijJXsSWv5Rm6-oNKidSm01OnOnh36FJrESqmscu3cBA7oOY4Ok9cgvbN1bTyKM1j2qFwaQAhV8JyO_N6-PfAnbc97QOKmdV7CWJChbghoQJZs-HaGlmAZa4IB9_N4ldg9z5G9KaQEXiu48/s400/e4c139f0-ed71-476c-9094-4019b5ef8bc3_1.12876b4690f7b8958b4c1407c2f2bb1f.jpg)
Pi designed clock
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8q0bFcgqtj9Q6ckKCxzP_os3qwA3CrijhQZ0Rl2DXclAJWK8Kk3qm7jrmPRVa_ct7fzBUaQ0xnvVG5l8oQuYLulfLhEnSSHWF0HXEePWjk0B2iPm1nvupb8Hs7eFMeLuD5fwQJVA9cz1k/s640/pirellimt90.jpg)
Pi designed tires