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The circumference of a sphere is the circumference, or length, of any one of its great circles. ... When a circle's diameter is 1, its circumference is ...
The ratio of a circle's circumference to its diameter is π (pi), an irrational constant approximately equal to 3.141592654. The ratio of a circle's circumference to its radius is 2 π . [ a ] Thus the circumference C is related to the radius r and diameter d by: C = 2 π r = π d . {\displaystyle C=2\pi r=\pi d.}
The area of a circle is to the square on its diameter as 11 to 14. ... The ratio of the circumference of any circle to its diameter is greater than but less than . ...
It has a diameter of 10 and a stated circumference of "32" (not 31.4159~); the chord of 90° has length stated as "7" (not 7.0710~). The Indiana pi bill was bill 246 of the 1897 sitting of the Indiana General Assembly , one of the most notorious attempts to establish mathematical truth by legislative fiat .
The circumference is 2 ... The conventional definition in pre-calculus geometry is the ratio of the circumference of a circle to its diameter:
The perimeter of a circle, often called the circumference, is proportional to its diameter and its radius. That is to say, there exists a constant number pi, π (the Greek p for perimeter), such that if P is the circle's perimeter and D its diameter then, =.
circumference C diameter D ... a diameter of a circle is any straight line segment that passes through the centre of the circle and whose endpoints lie on the circle.
The number π (/ p aɪ / ⓘ; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.