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A ray is a portion of a line that starts at a point and extends infinitely in one direction. It does not have an endpoint and continues indefinitely in that direction.
You cannot. A ray is infinite in one direction and so the midpoint would be infinitely far in that direction.
It is the opposite ray.
Ray - A ray is part of a line that has one endpoint. It continues in one direction without ending.
A ray in geometry is a line with a single endpoint and extends indefinitely in one specified direction.
A plane is 2-dimensional, and has infinite extent in any direction.