Parallel Lines and Parallelograms

Draw and explain parallel lines.Draw and define parallelograms.

What is a parallel line?

What is a parallel line?

• Parallel lines never cross.

What is a parallelogram?

A parallelogram has four sides, and opposite sides are parallel.

A parallelogram has four sides, and opposite sides are parallel.

Parallel

Measure the length of opposite sides on parallelograms A, B, and C

What parallelograms can you find in our classroom?

Parallelograms and Rectangles

What makes them different from each other?

Look at the shapes on page 132.

• Are some of these parallelograms also rectangles?

Look at the shapes on page 132.

• Are some of these parallelograms also rectangles?

• Which ones?

Look at the shapes on page 132.

The other parallelograms are not rectangles. How do these parallelograms differ from rectangles?

Look at the shapes on page 132.

How are all parallelograms like rectangles?

Do page 132

• Draw skinny and fat parallelograms.• Draw some with square corners.• Draw some with non-square corners and sides

that slant differently.

Visual Thinking

• Can you find the hidden parallelograms?

Visual Thinking

• Can you find the hidden parallelograms on page 133?

Parallel

Parallelograms

Relate Different Quadrilaterals

• Today’s Goal: Describe quadrilaterals, parallelograms, rectangles, and squares.

• Categorize quadrilaterals.• Describe how quadrilaterals are alike and

different

Vocabulary

• quadrilateral• parallelogram• rectangle• right angle• square

Quadrilaterals

Draw a square.

Draw a rectangle.

Draw a parallelogram.

Draw another shape with 4 sides:

What do all of these shapes have in common?

Draw a square.

Draw a rectangle.

Draw a parallelogram.

Draw another shape with 4 sides:

All of these shapes have 4 sides and each side is a line segment.

square

rectangle

parallelogram

quadrilateral

All of these shapes are quadrilaterals!

Quadri means four latus means sides

square

rectangle

parallelogram

quadrilateral

Quadrilateral means 4 sides.

square

rectangle

parallelogram

quadrilateral

Draw 4 parallelograms on your board.

• What is a parallelogram?

• Are all parallelograms quadrilaterals?

• Are all quadrilaterals parallelograms?

Draw 3 rectangles on your board.

• What is a rectangle?• Are all rectangles quadrilaterals?• Are all quadrilaterals rectangles?• Are all rectangles parallelograms?• Are all parallelograms rectangles?

Draw 3 squares on your board.

• What is a square?• Are all squares quadrilaterals?• Are all quadrilaterals squares?• Are all squares parallelograms?• Are all parallelograms squares?• Are all squares rectangles?• Are all rectangles squares?

Sort Quadrilaterals

• Cut out the shapes on page 135.

• Separate the shapes into quadrilaterals and not quadrilaterals.

• Which shapes are quadrilaterals?

• Why are all of the shapes that you listed quadrilaterals?

Sort Quadrilaterals

• Sort the quadrilaterals into two groups: parallelograms and not parallelograms

• Which shapes are parallelograms?

Sort Quadrilaterals

• Sort the quadrilaterals into two groups: rectangles and not rectangles

• Which shapes are rectangles?

Sort Quadrilaterals

• Sort the quadrilaterals into two groups: squares and not squares

• Which shapes are squares?

Identify Quadrilaterals

• Quadrilateral• Parallelogram• Rectangle• square

Identify Quadrilaterals

• Quadrilateral• Parallelogram• Rectangle• square

Identify Quadrilaterals

• Quadrilateral• Parallelogram• Rectangle• square

Now it is your turn!

• Do page 137. • Place a check mark beside each word that

names the shape.