Answer:
Yes.
Given \[\vec{A}+\,\vec{B}+\vec{C}+\vec{D}=\vec{0}\] or \[\vec{A}+\,\vec{B}+\vec{C}=\vec{0}-\vec{D}=-\vec{D}\]
Hence magnitude of \[(\vec{A}+\,\vec{B}+\vec{C})\]must be
equal to the magnitude of \[\vec{D}\].
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