Signs of equality of triangles презентация

The goals lessons: Develop skills to apply the features of equality of triangles to solve problems, recognize the equal triangles to prove their equality, to conclude equality of some of their elements; Creative development abilities of pupils, cognitive activity, interest in the subject.

Lesson Plan: 1. Organization of the beginning of the lesson (2-3 min.). 2. Explanation of the new material (10 min.). 3. Fizkultminutka 4. Test your attentiveness.(15 min.). 5. Playing with matches.(10min) 6. Setting the home (3-4 min.).

The first sign of equality of triangles: triangles are equal if they have two equal sides and an angle there between.

The second sign of equality of triangles: triangles are equal if they are equal to two angles and the side between them.

The third sign of equality of triangles: triangles are equal if they are equal to the three parties.

4. Fizkultminutka 4.1 Inhale breath, stretched. 4.2 Hands - up, worked her fingers - to make different triangles. 4.3 With his left hand in the air to draw a triangle, then - right, and - two. 4.4 In tandem with the neighbor (I have two hands - the two sides, a neighbor helps make a triangle). 4.5 Draw a triangle on the floor of each leg. 4.6 shook off fatigue with hands, feet. Sit down.

1. Of the five matches be 2 equilateral triangles. 2. Of the six matches to make four equilateral triangles.

Good bye