Changes

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*Process:

*Process:

# Recall the figure trapezium abd its properties.

# Recall the figure trapezium and its properties.

# State that when two non- parallel sides are equal it is an isosceles trapezium.

# State that a trapezium with two non- parallel sides equal is an isosceles trapezium.

# By moving the vertices of the trapezium, you can observe trapeziums of different sizes and shapes.

# By moving the vertices of the trapezium, you can observe trapeziums of different sizes and shapes.

# Make sure you note when your trapezoid turns into a rectangle.

# Make sure you note when your trapezium turns into a rectangle.

# Observe the symmetry of an isosceles trapezoid

# Observe the symmetry of an isosceles trapezium.

# Study its properties.

# Study its properties.

# Drag the vertices of the trapezoid and observe your angle measures.

# Drag the vertices of the trapezium and observe your angle measures.

# Make a conjecture about the base angles of an isosceles trapezoid. (Both of the parallel sides are considered bases, so a trapezoid has two pairs of base angles.)

# Make a conjecture about the base angles of an isosceles trapezium. (Both of the parallel sides are considered bases, so a trapezium has two pairs of base angles.)

*Developmental Questions:

*Developmental Questions:

# What are parallel lines ?

# What are parallel lines ?