Properties of Rectangles:

1. All 4 angles are right angles

2. Opposing sides are parallel and congruent

3. Opposing angles are congruent

4. Consecutive angles are supplementary

5. Diagonals bisect each other

How can I tell that a parallelogram is a rectangle?

By checking the diagonals! Use the distance formula to calculate and check if the diagonals and opposing sides are congruent, if they are, the parallelogram is a rectangle.

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Second Theorem:

If the slopes of the opposing sides in a parallelogram are EQUAL, it's a rectangle ONLY IF the opposing sides are congruent.

What would that mean?

Slope Formula:

Using the Slope:

Quadrilateral JKLM has the vertices:

J(-2, 3), K (1, 4), L(3, -2), and M(0, -3)

Is JKLM a rectangle?

Some text here about the topic of discussion

Calculate the distance of all the sides: