1.

ABCD is a quadrilateral whose diagonals are AC and BD. Which one of the following is correct?

A. \(\overrightarrow {{\rm{BA}}} + \overrightarrow {{\rm{CD}}} = \overrightarrow {{\rm{AC}}} + \overrightarrow {{\rm{DB}}} \)
B. \(\overrightarrow {{\rm{BA}}} + \overrightarrow {{\rm{CD}}} = \overrightarrow {{\rm{BD}}} + \overrightarrow {{\rm{CA}}} \)
C. \(\overrightarrow {{\rm{BA}}} + \overrightarrow {{\rm{CD}}} = \overrightarrow {{\rm{AC}}} + \overrightarrow {{\rm{BD}}} \)
D. \(\overrightarrow {{\rm{BA}}} + \overrightarrow {{\rm{CD}}} = \overrightarrow {{\rm{BC}}} + \overrightarrow {{\rm{AD}}}\)
Answer» C. \(\overrightarrow {{\rm{BA}}} + \overrightarrow {{\rm{CD}}} = \overrightarrow {{\rm{AC}}} + \overrightarrow {{\rm{BD}}} \)


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