Which of the following is not true for a parallelogram.
opposite angles are bisect by the diagonals
Step 1: Explanation for correct option.
For option B : opposite angles are bisect by the diagonals
Thus, opposite angles are bisected by the diagonals is not the property of a parallelogram.
So option B is correct
Step 2: Explanation for incorrect option.
For option (A): opposite sides are equal
Opposite sides of a parallelogram are equal is a property of a parallelogram.
So option A is incorrect
For option (C): opposite angles are equal
Opposite angles of a parallelogram are equal is a property of a parallelogram.
So option C is incorrect
For option (D): diagonals bisect each other
Diagonals of a parallelogram bisect each other is a property of a parallelogram.
So option D is incorrect
Hence, correct option is (B).