Name the below quadrilaterals.

Ext: Can you find another name?

Why is a parallelogram called a parallelogram?

What does parallel mean?

Two lines are called parallel if they never intersect.

Parallel lines

Not parallel lines

Draw two pairs of parallel lines such thatthe lines of the second pair intersect the lines of

the first pair.

You will get a quadrilateral.

Draw a few more …

In each one measure the lengths of the sides.What do you notice about the length of the

opposite sides?

A parallelogram is a quadrilateral with two pairs of parallel sides

The diagonals of a square:1) are of equal length 2) bisect each other (intersect at their

midpoints)3) intersect at a right angle

The diagonals of a rectangle:1) are of equal length 2) bisect each other (intersect at

their midpoints)

Reminder:

Let’s look at the diagonals of a parallelogram:

Draw different parallelograms in your books with diagonals

Measure along each diagonal the distance from each vertex to the intersection point and the angle at which the diagonals intersect.