1. Vocabulary Square Parallelogram Rectangle Pair Rhombus Parallel
Quadrilateral
Pair of equal sides
Trapezoid

2. Parallel Lines
Parallel lines exist everywhere, if you look for them. Here are some examples of parallel lines.

3. These are lines that never intersect.
Parallel Lines
These are lines that never intersect.
Intersect means that the lines never touch, they always stay the same distance from each other.
For Example:
These two pencils are parallel

4. What are not parallel lines?
Any lines that intersect are not parallel.

5. Share with your partner
Look around the room and see if you can find any parallel lines. What do you see?
_____________ has parallel lines.
Explain to your partner what a parallel line is and where you can find them.
Parallel lines are _______________
and you can find them ______________.

6. Pairs of Parallel Lines
When we are talking about parallel lines, we are always talking about pairs of parallel lines.
What is a “pair”?
How many are in a pair?
Let’s look at this…

7. What things come in pairs?
Things that come in pairs

8. Pair …
of eyes
of shoes
of hands
of crutches
of socks

9. “Pairs”
All of these things are pairs, but how many are in the pair?
Tell your partner how many socks are in a pair.
That’s right, 2!!!

10. Let’s see if you get this…
Pairs
2 socks = 1 pair of socks 2 shoes = 1 pair of shoes 1 pair of crutches = 2 crutches 1 pair of eyes = 2 eyes 2 hands = 1 pair of hands
Good Job!!
Let’s see if you get this…

11. Polygons with Parallel Lines
Some polygons have parallel lines.
Remember, you have to have 2 lines (pair) to make 1 pair of parallel lines.
Let’s take a look

12. Parallel lines exist in geometry If you look at polygons you can find parallel lines. Remember that parallel lines never touch.

13. Can you guess which polygon has parallel lines
Can you guess which polygon has parallel lines? Talk to your partner and explain which polygon has parallel lines: The polygon on the right/left has parallel lines because ________________.

14. Count the pairs of parallel lines in the polygons2
This shape has _______ pairs of parallel lines.
2 pairs
1 pair 2
This shape has _______ pairs of parallel lines.
1 pair
2 pairs
1 pair 1
This shape has _____ pairs of parallel lines.

15. Find how many pairs of parallel lines are in the polygons.

17. We learned that the prefix quadri means 4, and that a polygon with four sides is called a quadrilateral. Let’s take a look at some different types of quadrilaterals.

18. quadrilaterals How do you know if a polygon is a quadrilateral?
If a polygon has 4 sides, it is
quadrilateral.
The sides and angles are
what determine the type
of quadrilateral it is. 1 4 2 3

19. square The perfect quadrilateral. What makes a square?
A square has 4 equal sides.
A square has 4 right angles.

20. rectangle What makes a rectangle?
A rectangle has 2 pairs of equal sides.
A rectangle has 4 right angles.
That means that a square is also a rectangle.
Turn to your partner and tell them why a square is a rectangle.
A square is a rectangle because ________________.

21. rhombus The rhombus is the cousin of the square.
A rhombus has 4 equal sides.
But, a rhombus can have any angles.
That means that a square is also a rhombus.
Turn to your partner and
Tell them why a square is
A rhombus.
A square is a rhombus because ________________________.

22. parallelogram The parallelogram is the cousin of the rectangle.
A parallelogram has 2 pairs of equal sides.
But, a parallelogram can have any angles.
Talk to your partner. Do you think that a square or a rectangle is a parallelogram. Why?

23. my turn
Which figure has two pairs of equal sides? A circle B hexagon C rectangle D octagon

24. your turn
Which figure always has 4 equal sides? A circle B hexagon C rectangle D square

25. my turn
One side of a rectangle is 3 ins. long. Another side is 7 ins. long. What are the lengths of the other sides of the rectangle? A They could be any length B 3 ins. and 3ins. C 7 ins. and 7 ins. D 3 ins. and 7 ins.
7 in
3 in
3 in
7 in

26. your turn
One side of a square is 5 cms. long. What are the lengths of the other sides of the square? A 5 cms B 10 cms C 15 cms D 20 cms
5 cms
5 cms
5 cms
5 cms

27. So what did you learn today?
What is a pair?
A pair is ________________________.
What are parallel lines?
Parallel lines are __________________.
What is a quadrilateral?
A quadrilateral is __________________.
What are the 4 different types of quadrilaterals?
___________, ___________, __________, and ___________ are different types of quadrilaterals.