Vocabulary Square Parallelogram Rectangle Pair Rhombus Parallel Quadrilateral

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

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

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

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

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 _______.

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…

What things come in pairs? Things that come in pairs

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

“Pairs” • All of these things are pairs, but how many are in the pair? • Tell your partner how many ’t s socks are in a pair. ! a ! ! h T t, 2 h g ri

Pairs 2 socks = 1 pair of socks 2 shoes = 1 pair of shoes u o 1 pair of crutches fi y = 2 crutches e … e s s eyes 1 pairs of = 2 eyes i h ’ t t Le g=et 1 pair of hands 2 hands d o o G b!! Jo

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

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

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 ________.

Count the pairs of parallel lines in the polygons 2 This shape has _______ pairs of parallel lines. 21 pairs pair 2 This shape has _______ pairs of parallel lines. pair 21 pairs 1 pair 1 This shape has _____ pairs of parallel lines.

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

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.

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 4 what determine the type of quadrilateral it is. 1 2 3

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

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 ________. • •

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 ____________.

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?

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

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

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 B C D They could be any length 3 ins. and 3 ins. 7 ins. and 7 ins. 3 ins. and 7 ins. 7 in 3 in 7 in

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

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.