Review question

Ref: R6641

## Suggestion

Draw a diagram showing points $A(-3,1)$, $B(4,2)$, $C(9,-3)$, $D(2,-4)$.

1. For the figure $ABCD$ state and prove a fact (or facts) sufficient to ensure that it is a parallelogram.

What facts do you know about a parallelogram? Which of these facts show that $ABCD$ is definitely a parallelogram? Can we prove one of these facts here?

1. Prove that $ABCD$ is not a square.

Which properties of a square are not met by every parallelogram? Could we show that one of these square properties is not met by this parallelogram?