Sunday, 30 April 2017

π | pi

The Greek letter π (pi) was derived from the ancient Phoenician letter 𐤐 ().

The number π (named so after the first letter of the Greek word περιφέρεια, “circumference”) is a mathematical constant, a transcendental number with approximate value of 3.141592. It is defined as the ratio of the circumference of a circle circumference C to its diameter D (or to twice the radius r):

π = C/D = C/2r

The lower-case letter π is also used as a symbol of:

More photos related to circles, letters, numbers and sea glass @ Shutterstock.

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