- AD
- BA
- CB
- DC
Step-by-Step Solution
Conditions A, B and C are standard sufficient conditions. Condition D (one pair parallel, the other pair merely equal) can also produce an isosceles trapezium, so it is not always sufficient.
Answer: A) D
Four conditions are proposed to decide if a quadrilateral is a parallelogram:
A) both pairs of opposite sides equal,
B) one pair of opposite sides equal and parallel,
C) diagonals bisect each other,
D) one pair of opposite sides parallel and the other pair equal.
Which of these is NOT always sufficient by itself?
Class 9Conditions for a ParallelogramGeometry — Quadrilaterals
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