Parallelogram Theorems: Quick Check-in

Interact with each app for a minute or two. As you do, be sure to move LARGE POINTS around and be sure to mess with both sliders as well! [br][br]Please answer the question that comes after each app.

The animation above illustrates which of the following?

If a quadrilateral is a parallelogram, then both pairs of opposite angles are congruent. If a quadrilateral is a parallelogram, then both pairs of opposite sides are congruent. Vertical angles are congruent. If a quadrilateral is a parallelogram, then its diagonals bisect each other.

The animation above illustrates which of the following?

Vertical angles are congruent. If a quadrilateral is a parallelogram, then its diagonals bisect each other. If a quadrilateral is a parallelogram, then both pairs of opposite angles are congruent. If a quadrilateral is a parallelogram, then both pairs of opposite sides are congruent.

The animation above illustrates which of the following?

If a quadrilateral is a parallelogram, then both pairs of opposite angles are congruent. Vertical angles are congruent. If a quadrilateral is a parallelogram, then each diagonal intersects the other diagonal at its midpoint. If a quadrilateral is a parallelogram, then both pairs of opposite sides are congruent. If a quadrilateral is a parallelogram, then its diagonals bisect each other.

Parallelogram Theorems: Quick Check-in

Information: Parallelogram Theorems: Quick Check-in