Introduction to Visual Representation of Angles-1/3
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Introduction to Visual Representation of Angles-1/3
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Each pupil should choose an origami sheet.
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A discussion question: What is the name for the shape of your sheet? Explain
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Answer: The shape is named a square having all sides of equal length and all angles equal.
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Folding instructions: Fold two opposite vertices.
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Folding instructions: After opening the fold cut along the diagonal to obtain two triangular shapes.
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Folding instructions: Fold two opposite vertices as shown with both triangles.
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From this stage all activity should be done with both triangles.
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Folding instructions:Fold two vertices as shown with both triangles.
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Folding instructions: Fold two colored sides onto the line of symmetry with both triangles to form kite shapes.
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Check that pupils have folded the correct colored sides.
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Folding instructions: Turn over both shapes.
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Folding instructions: Fold the two adjacent sides onto each other as shown with both triangles.
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Folding instructions: Fold as shown in the animation.
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Folding instructions: Turn over both shapes.
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Folding instructions: Fold as shown in the animation.
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Folding instructions: Fold the vertices on to each other as shown and open the fold with both triangles.
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Folding instructions: On one of the shapes open the colored right angled triangle shape.
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Folding instructions:On one of the shapes mark the shown segment in red.
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Check that the correct segments are colored in red.
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Folding instructions: On one of the shapes cut the marked red segment.
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Before the cutting check once again that the correct lines are marked.
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Folding instructions: Turn the one shape and fold the quadrilateral inside as shown.
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Folding instructions: With one shape fold the smaller triangle shape onto the larger triangle shape.
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You now have two mouse shapes. One should be kept in your folder for the next lesson and take the other one home.
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The next lesson: The circle and representation of an angle.
- Lesson Aims
The first lesson for the learning of the concept of angle using the mouse shaped made in the lesson as an aide.
- Name of Model
A mouse.
- Lesson Structure
The mouse,circle and angle as a measure of rotation.
- Lesson Content
This lesson is the first of three lessons teaching the concept of angle. Through the folding process the pupils have a dynamic experience of this concept. The idea of measure of rotation as a method of understanding the concept of angle is applied with moving the mouse shape clockwise. This method and definition of an angle as a measure of rotation is understood while creating the angle by the rotational movement. Two mice are folded-one to take home and the other for the next lesson on the subject of angle.
- Materials
Scissors, several sheets of A4 printing paper and 3 origami paper sheets 15cm x 15 cm.
