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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 regular polygon is half its perimeter multiplied by the distance from its center to its sides, and because the sequence tends to a circle, the corresponding formula–that the area is half the circumference times the radius–namely, A = 1 / 2 × 2πr × r, holds for a circle.
Diameter of the Local Supercluster and the largest voids and filaments 2.8 Ym End of Greatness ~5 Ym Diameter of the Horologium Supercluster [50] 9.461 Ym: Diameter of the Pisces–Cetus Supercluster Complex, the supercluster complex which includes Earth 10 25: 10 Ym: 13 Ym Length of the Sloan Great Wall, a giant wall of galaxies (galactic ...
Name Bullet Case length Rim Base Shoulder Neck OAL .25-25 Stevens: 6.5 (.257) 60.2 (2.37) 9.6 (.376) 8.2 (.323) - 7.2 (.282) 66.8 (2.63) .256 Win Magnum
A diagram illustrating great-circle distance (drawn in red) between two points on a sphere, P and Q. Two antipodal points, u and v are also shown.. The great-circle distance, orthodromic distance, or spherical distance is the distance between two points on a sphere, measured along the great-circle arc between them.
Following the so-called "quarter-girth formula" (the square of one quarter of the circumference in inches multiplied by 1 ⁄ 144 of the length in feet), the notional log is four feet in circumference, one inch of which yields the hoppus board foot, 1 foot yields the hoppus foot, and 50 feet yields a hoppus ton.
A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D (the maximum thread diameter) and the pitch P, both expressed in millimetres and separated by a dash or sometimes the multiplication sign, × (e.g. M8-1.25 or M8×1.25). If the pitch is the normally used "coarse" pitch listed in ISO 261 or ...
In a piston engine, the bore (or cylinder bore) is the diameter of each cylinder. Engine displacement is calculated based on bore, stroke length and the number of cylinders: [1] displacement = π ( 1 / 2 × bore ) 2 × stroke × n cylinders