Mathematics for IGCSE & O level - Vectors (Section 1 - No. 38)
In a parallelogram OABC, which of the following must be true?
\(\vec{OA} = \vec{BC}\)
\(\vec{OA} + \vec{OC} = \vec{OB}\)
\(\vec{AC} = \vec{OA} + \vec{OC}\)
\(\vec{AB} = \vec{OC}\)
คำอธิบาย
In a parallelogram, opposite sides are equal and parallel. Also, OA+AB = OB