1. Points, Lines, and Planes
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Rays with an endpoint E start at E and continue indefinitely in some direction. Which directions are possible within this diagram?
EA, EB, EC, and ED
A ray that has the endpoint E starts at point E, and continues on indefinitely in some direction. Note that E is the intersection of AC and BD. One of the rays that has endpoint E is EA.
We have four directions available to us to find these rays: through A, B, C, or D. Thus, there are a total of four possible rays that have endpoint E. cc EA& EB EC& ED