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In this context, a diameter is any chord which passes through the conic's centre. A diameter of an ellipse is any line passing through the centre of the ellipse. [7] Half of any such diameter may be called a semidiameter, although this term is most often a synonym for the radius of a circle or sphere. [8] The longest diameter is called the ...
Diameter: 5.4 × 10 61 l P: 8.7 × 10 26 m or 9.2 × 10 10 light-years: Mass: ... Physical quantities that have different dimensions (such as time and length) cannot ...
A temporal dimension, or time dimension, is a dimension of time. Time is often referred to as the " fourth dimension " for this reason, but that is not to imply that it is a spatial dimension [ citation needed ] .
In differential geometry, the diameter is an important global Riemannian invariant. Every compact set in a Riemannian manifold, and every compact Riemannian manifold itself, has finite diameter. For instance, the unit sphere of any dimension, viewed as a Riemannian manifold, has diameter .
Diameter (group theory), the maximum diameter of a Cayley graph of the group; Equivalent diameter, the diameter of a circle or sphere with the same area, perimeter, or volume as another object; Hydraulic diameter, the equivalent diameter of a tube or channel for fluids; Kinetic diameter, a measure of particles in a gas related to the mean free path
an object of diameter 1 AU (149 597 871 km) at a distance of 1 parsec (pc) Thus, the angular diameter of Earth's orbit around the Sun as viewed from a distance of 1 pc is 2″, as 1 AU is the mean radius of Earth's orbit. The angular diameter of the Sun, from a distance of one light-year, is 0.03″, and that of Earth 0.0003″. The angular ...
Semicircle: one of the two possible arcs determined by the endpoints of a diameter, taking its midpoint as centre. In non-technical common usage it may mean the interior of the two-dimensional region bounded by a diameter and one of its arcs, that is technically called a half-disc. A half-disc is a special case of a segment, namely the largest one.
In ten dimensions, less than 2% of the cube is filled by the sphere, so that typically more than 50 attempts will be needed. In seventy dimensions, less than 10 − 24 {\displaystyle 10^{-24}} of the cube is filled, meaning typically a trillion quadrillion trials will be needed, far more than a computer could ever carry out.