An inclination is the angle between a reference line or plane and another line or plane. In manipulative 1, the inclination of the line is respective to the x-axis. Note that the inclination is measured with an angle between 0° and 90° (0° < α ≤ 90°).
An incline is a surface that is sloped relative to the horizontal.
An inclined plane is a plane that is sloped relative to a reference plane. For astronomical objects, the reference plane contains the equator of the object about which another object orbits.
In manipulative 2, the blue ellipse represents a plane containing the equator of a star. The red ellipse represents a plane containing the orbit of a planet.
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