planar parallel surfaces
1Planar graph — Example graphs Planar Nonplanar Butterfly graph K5 The complete graph K4 …
2Differential geometry of surfaces — Carl Friedrich Gauss in 1828 In mathematics, the differential geometry of surfaces deals with smooth surfaces with various additional structures, most often, a Riemannian metric. Surfaces have been extensively studied from various perspectives:… …
3Mechanics of planar particle motion — Classical mechanics Newton s Second Law History of classical mechanics  …
4Loudspeaker — For other uses, see Loudspeaker (disambiguation). An inexpensive, low fidelity 3½ inch speaker, typically found in small radios …
5Field electron emission — It is requested that a diagram or diagrams be included in this article to improve its quality. For more information, refer to discussion on this page and/or the listing at Wikipedia:Requested images. Field emission (FE) (also known as field… …
6Multiview orthographic projection — Part of a series on …
7Friction — For other uses, see Friction (disambiguation). Classical mechanics …
8Microlens — A microlens is a small lens, generally with a diameter less than a millimetre (mm) and often as small as 10 micrometres (µm). The small sizes of the lenses means that a simple design can give good optical quality but sometimes unwanted effects… …
9Space charge — is a concept in which excess electric charge is treated as a continuum of charge distributed over a region of space (either a volume or an area) rather than distinct point like charges. This model typically applies when charge carriers have been… …
10Cross section (geometry) — For cross sections in architecture and engineering, see Multiview orthographic projection#Cross section …
