## Triangles

#### Triangles 1-using your imagination.

**Topic**Triangles

**Description of the activity**The folding procedures enable the children to recognize properties of a triangle.

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#### Triangles activity B

**Lesson Aims**The pupils will be able to identify and investigate triangles according to sides and vertices.

**Name of Model**A mouse.

**The Lesson structure**Triangles activity A, Triangles activity B , Polygon activity A, Polygon activity A, Polygon activities B 1/2 , Polygon activities B 2/2 , Polygon activity C , A measuring tool for comparison of lengths , Quadrilaterals A , Quadrilaterals B: Square & Rectangle – same and different, Line of reflective symmetry 1/2, Line of reflective symmetry 2/2, Quadrilaterals C: Square & Rectangle , Lines of symmetry in quadrilaterals, Translation of shapes

**Lesson content**In this lesson, the pupils will investigate the triangular shapes as formed in the folding process. The classification is made according to the number of sides. At the conclusion of the folding process, the final model comes as a surprise. The pupils learn new concepts and review previously learnt concepts.

**Prior Knowledge**

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#### Introduction to Visual Representation of Angles-1/3

**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.

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#### Angles-2/3

**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.

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#### Angles-3/3

**Lesson Aims**Pupils will recognize that the size of an angle is determined by the measure of rotation in relation to a given segment line.

**Name of Model**The mouse game looking for the cheese.

**Lesson Structure**Mouse, circle and the visualization of the mouse rotation on the circle.

**Lesson Content**This lesson is the 3rd activity demonstrating the concept of angle as measure of rotation.

**Materials**Glue stick,mouse and circle.

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#### Classification of triangles using sides and angles

**Lesson Aims**- Classifying triangles according to the angles of the triangles.
- Identifying right angled triangles, acute triangles and obtuse triangles.
- Classifying triangles according to the sides of the triangles.
- Drawing and naming triangles according to both properties of sides and angles.

**Name of Model**The angled bird.

**Lesson Structure**Measuring tool,composition and decomposition of polygons, polygons 3, parallel lines and sides,circle,mouse,visual representation of angles-measure of rotation,angled bird.

**Lesson content**In this lesson pupilsinvestigate different triangles formed as a result of folding the model. A surprise final model using old and new terms for descriptions.

**Prior Knowledge**The concept of a right angle and visual representation of an angle.

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