in a parallelogram abcd if ac = diagnol bd then find a
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Answer:
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
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