if two vector A and B are the diagonal of parallelogram then prove that AC +BD=2BC
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ABCD is a parallelogram so, AB∣∣CD and AD∣∣BC
AC
=
AB
+
BC
(addition Theorem)
BD
=
BA
+
AD
(addition Theorem)
AC
+
BD
=
AB
+
BC
+
BA
+
AD
=
AB
+
BC
−
AB
+
BC
=2
BC
solution
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