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What is the definition for datum dimension?
A dimension that exactly locates a reference point, reference line, or reference plane
What is a skew plane?
There is no such thing as a skew plane - in isolation. It can only be skew with reference to something else.
If you run on a plane are you moving faster than the plane?
If the frame of reference is the ground, and if you are running forward, you are indeed moving faster than the plane. If you are running toward the rear of the plane, you are moving slower than the plane.
What is the angular distance around the horizon from some reference point?
If the reference point and an object are both on the horizon then the angular distance to the object, relative to the reference point is simply the angle formed between the two rays from the observer to object and to the reference point. If either the object or reference point (or both) are not in the plane of the horizon then the appropriate rays are the projections of the rays from the observer onto the plane containing the horizon.
Difference between inclined plane and wedge?
From one viewpoint just a matter of frame of reference...
