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List of topics related to π; Pole and polar – Unique point and line of a conic section; Power of a point – Relative distance of a point from a circle; Radical axis – All points whose relative distances to two circles are same; Radius – Segment in a circle or sphere from its center to its perimeter or surface and its length
The radii of these objects range over three orders of magnitude, from planetary-mass objects like dwarf planets and some moons to the planets and the Sun. This list does not include small Solar System bodies , but it does include a sample of possible planetary-mass objects whose shapes have yet to be determined.
These are lists of research topics, research problems and current research activities in various scientific areas. Pages in category "Lists of research topics" The following 3 pages are in this category, out of 3 total.
Watercolour of a crwth from Pennant's A tour in Wales, 1781. The name crwth is Welsh, derived from a Proto-Celtic noun * krutto-("round object" [4]) which refers to a swelling or bulging out, a pregnant appearance or a protuberance, and it is speculated that it came to be used for the instrument because of its bulging shape.
In more generality, by the same principle, the volume of any cylinder is the product of the area of a base and the height. For example, an elliptic cylinder with a base having semi-major axis a, semi-minor axis b and height h has a volume V = Ah, where A is the area of the base ellipse (= π ab).
Small Solar System bodies – smallest bodies, including asteroids, comets, Kuiper belt objects, and dust. Astronomy divided by general technique used for astronomical research: Astrometry – study of the position of objects in the sky and their changes of position. Defines the system of coordinates used and the kinematics of objects in our ...
Having a constant diameter, measured at varying angles around the shape, is often considered to be a simple measurement of roundness.This is misleading. [3]Although constant diameter is a necessary condition for roundness, it is not a sufficient condition for roundness: shapes exist that have constant diameter but are far from round.
In philosophy and the arts, a fundamental distinction exists between abstract and concrete entities. While there is no universally accepted definition, common examples illustrate the difference: numbers, sets, and ideas are typically classified as abstract objects, whereas plants, dogs, and planets are considered concrete objects.