all of the quadrilaterals, triangles, and many more. In fact, all the polygons.are plane figuresl
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Yes. Since an inclined plane is slanted, the stairs fit the definition. Another example of an inclined plane would be the seats of a stadium.
Do you mean Octagon? An octagon is an eight sided polygon. If you live in the USA: A stop sign is a great example.
A sphere as a polygon is a shape with three or more sides and a sphere has no sides
Yes as for example the French mathematician Rene Descartes created coordinated geometry which is plotted on the Cartesian plane.
It does not. For an explanation of "focal plane" see the question What is the focal plane?