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The Lénárt sphere and accessories are produced by the company Lénárt Educational Research and Technology. The basic set includes: [3] An eight-inch transparent plastic sphere; A torus-shaped support to place under the sphere; Hemispherical transparencies that fit over the sphere for students to draw on with marker pens or cut out shapes ...
Print/export Download as PDF; ... The following 39 pages are in this category, out of 39 total. ... Celestial sphere; Chinese puzzle ball;
Print/export Download as PDF; ... The following 7 pages are in this category, out of 7 total. ... Sphere (venue) This page was last ...
In geometry, a spherical polyhedron or spherical tiling is a tiling of the sphere in which the surface is divided or partitioned by great arcs into bounded regions called spherical polygons. A polyhedron whose vertices are equidistant from its center can be conveniently studied by projecting its edges onto the sphere to obtain a corresponding ...
A ball lens is an optical lens in the shape of a sphere. Formally, it is a bi-convex spherical lens with the same radius of curvature on both sides, and diameter equal to twice the radius of curvature. The same optical laws may be applied to analyze its imaging characteristics as for other lenses.
Pages for logged out editors learn more. ... (Top) 1 Solids from cutting a sphere with one or more planes. ... Print/export Download as PDF;
As early as 1693 Christiaan Huygens found that the volume and the surface area of the pseudosphere are finite, [3] despite the infinite extent of the shape along the axis of rotation. For a given edge radius R, the area is 4πR 2 just as it is for the sphere, while the volume is 2 / 3 πR 3 and therefore half that of a sphere of that ...
The only shape that casts a round shadow no matter which direction it is pointed is a sphere, and the ancient Greeks deduced that this must mean Earth is spherical. [ 8 ] The effect could be produced by a disk that always faces the Moon head-on during the eclipse, but this is inconsistent with the fact that the Moon is only rarely directly ...
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