Angles2/3


Chose one sheet of origami paper together with the 3 A4 sheets of printing paper.


Folding instructions: Fold two opposite sides on your origami sheet.


Folding instructions:Fold the longer sides of your rectangle onto each other in order to obtain the measuring tool.


The measuring tool: The tool is used for measuring right angles and side lengths.In this lesson it will be used to make the circle.


Folding instructions: Fold parallel shorter sides and open the fold. Color the folded line with a marker.


Folding instructions: Using a A4 sheet fold opposite sides onto each other and open the folds.


Instructions: Mark the intersection point of the folds and place your measuring tool in the place shown.


Instructions: Place the measuring tool exactly at the position point as shown.

Check that this is done exactly as required.


Instructions: After placing the tool in the correct place turn it in one direction and at each turn mark 2 dots.

יש לשים לב שהנקודות המסומנות הן דרך אותה הצלע של המודד.


A discussion question: After repeating the instruction what shape has been obtained? Explain.


Answer: If the dots are joined the shape is a circle.


A discussion question: Have you formed a circle?

Some pupils may not have done this exactly so another attempt should be made on an other sheet given guidance.


Folding instructions: Turn over the sheet.

The sheet is turned over to the side without points.


Folding instructions: Fold the two shorter sides onto each other.


Folding instructions: Fold the two shorter sides onto each other.


Folding instructions: Cut along the line of dots.


Folding instructions: Fold the circle as shown.


Folding instructions: Once again fold the circle as shown.


Folding instructions: Once again fold the circle as shown.


Folding instructions: Open the last fold to obtain a quarter shape of the circle.


Folding instructions: Open the quarter shape to obtain the shape of half a circle.


Folding instructions: Open the half circle to obtain a complete circle.


Next activity: Representing the concept of angle as a measure of rotation.
 Lesson Aims
The pupils will construct a circle using the measuring tool and marking dots at equal distances.
 Name of Model
Circle.
 Lesson Structure
Mouse and circle.
 Lesson Content
This is the second lesson in learning the concept of angle as a measure of a rotation. The following lesson will make use of the mouse and circle of the the two previous lessons to fully understand the dynamic approach of folding in order to see the formation of an angle as a process of rotation. It is suggested that the pupils make several circles.
 Materials
Scissors, origami paper and A4 sheets.