1. Postulates and Paragraph Proofs
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First, highlight CD.
Postulate 2.7
In the figure, CD and CE lie in plane P and DH and DJ lie in plane Q. Looking at the figure, we will state the postulate that can be used to show the given statement is true.
Let's first highlight CD.
Postulate 2.7 states the following. If two planes intersect, then their intersection is a line. Thus, plane P and plane Q intersect at CD.