Question

1. select all of the following properties that are always true for a parallelogram.

always true
not always true
diagonals bisect each other
diagonals are perpendicular
diagonals bisect opposite angles

Explanation:

Step1: Check diagonals bisect each other

A key property of all parallelograms is that their diagonals bisect each other. So this is always true.

Step2: Check diagonals are perpendicular

Only special parallelograms (rhombus, square) have perpendicular diagonals, not all. So this is not always true.

Step3: Check diagonals bisect opposite angles

Only special parallelograms (rhombus, square) have diagonals bisecting opposite angles, not all. So this is not always true.

Answer:

The property "diagonals bisect each other" should be marked as Always True; the other two properties should be marked as NOT Always True.