planes are used for cargo shipping, passenger shipping, or just sight seeing.
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Inclined planes are everywhere and are very useful. As a child, did you ever play on a slide or a see-saw? Both are inclined planes. Have you ever lived in a house? The roof of most houses are inclined planes. Entrance and exit ramps for highways and the highway itself are more examples of inclined planes. (If you ever have a chance, look at a roadway. Most roadways are not flat but are pitched so that water does not pool when it rains.)
Analytic Geometry is useful when manipulating equations for planes and straight lines. You can get more information about Analytic Geometry at the Wikipedia. Once on the page, type "Analytic Geometry" into the search field at the top of the page and press enter to bring up the information.
it can fly
two planes intersect in one line, or the planes could be parallel. by the way there is no such thing as skew planes...
The angle between two planes when the planes intersect at a point is the acute angle fixed by the normal vectors of the planes.