DB1M 26-5

• Wiskunde
• Middelbare school
• havo
• Leerjaar 1

7.4 Special Quadrilaterals

Planning

• New theory
  
• Quiz

Parallelogram

Parallelogram

Write down:

A parallelogram is a quadrilateral where both pairs of opposite sides are parallel.

Write down:

• Has point symmetry
• Opposite sides have the same length
• Diagonals divide each other in half
• Opposite angles are equal

Properties of a parallelogram

Write down:
A rhombus is a quadrilateral with four equal sides.
Which foto is a rhombus?

1. 
2. 
3. 
4. 

Write down:

• Diagonals are the axes of symmetry
• Diagonals are perpendicular
• Diagonals are bisectors of te angles
• All properties of a parallelogram

Properties of a rhombus

Trapezium

Write down:

A trapezium is a quadrilateral where at least one pair of opposite sides is parallel.

Wat do you notice?

Isosceles trapezium

Write down:

An isosceles triangle has one axis of symmetry.

Isosceles trapezium

What do you see?

1. Teddy bear
2. Kite
3. Flag

Kite

Write down:

A kite is a quadrilateral where at least one diagonal is an axis of symmetry.

Quiz

What is this?

1. Parallelogram
2. Trapezium
3. Kite
4. Rhombus

What is this?

1. Trapezium
2. Isosceles trapezium
3. Kite
4. Parallelogram

What is this?

1. Parallelogram
2. Trapezium
3. Kite
4. Rhombus

What is this?

1. Parallelogram
2. Trapezium
3. Isosceles trapezium
4. Kite

What is this?

1. Parallelogram
2. Trapezium
3. Kite
4. Rhombus

What do you want for homework?

The whole paragraph 7.4

Ex. 39, 44, 48, 49, 51 on page 62