Quiz
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What do we know about the line DC?
Yes.
We've been asked to consider whether or not line DC lies in plane DBC. The first thing we need to notice is that there is no line DC pictured in the diagram. However, DC is just the line created by connecting the points D and C. Let's add this to the diagram.
Since points D and C both lie in plane DBC, the line connecting them also lies in this plane.