An inclined plane is any surface with an upward slope away from a horizontal line. A wedge fits this description, however it could also be classified differently as having a declining slope from a parallel horizontal surface.
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An inclined plane is just what its name suggests. It is an plane that is inclined (anlged) to be steep. To make an inclined plane, draw a right angle (90 degrees) and connect the two extended lines with a diagonal line. It should look like a triangle.
A wedge can look brown, tan, any color if you paint it. It can be thick, thin, big, or small.
There is no polyhedron with only three sides - a polyhedron being a 3-D shape with plane sides. Once you remove the restriction of plane sides you get several options, some of which are: A cylinder or a cylindrical shape with partial spheres at each end (like a medicine capsule). A segment of a torus (a doughnut with a chunk cut out of it). A spherical wedge - like a segment of a round cheese (that is, real cheese, not the processed plastic that some people consider cheese).
Coplanar means "on the same plane". A plane can be a figure or shape like a rectangle. Coplanar points means points that belong on the same plane.
An XY plane is a standard graphing coordinate plane that can be used to graph any point. It looks like a plus sign with arrows on the ends of the lines.