Topic: Theorem about the sum of interior angles of a triangle. Class: 7
Technological map of the lesson
The subject of the lesson
Theorem about the sum of interior angles of a triangle
Purpose, tasks
1. Educational: providing students with scientific information about the lessons.
2. Educational: inculcating the concepts of morals and manners into the minds of students, teaching students to be grateful.
3. Developer: development of students' speech, behavior, communication culture.
4. Vocational referral: referral to engineering, architectural professions through the topic.
5. National education: education to love the country.
The content of the educational process. To increase the activity of students on the topic.
Technology of implementation of educational process Type of lesson: Providing new knowledge.
Style: Oral, written.
Control; Oral control, questions and answers, test.
Assessment; Evaluation on a 5-point system.
Future plans. Teacher: mastering advanced pedagogical technologies, searching for and improving ways to use them in education, developing students' speech, working on themselves
Reader; to work independently with the textbook, express one's opinion freely orally and in writing, approve the opinion of peers and express new ideas.
Block diagram of the lesson
t\r Stages of the lesson Time
1 Organizational part 2 minutes
2 World news 2 minutes
3 Information about didactic games 2 minutes
4 Main part 1 minute
5 New topic description 26 minutes
6 Strengthening 10 minutes
7 Evaluation criteria 1 minute
8 Homework 1 minute
Course Outline:
a. Organizational part: (2 minutes)
b. World news (2 minutes)
s. New topic statement: (26 minutes)
d. Reinforcement: (10 minutes)
Plan:
General information about the topics covered.
To teach about the theorem about the sum of the interior angles of a triangle
Organization of didactic games during the lesson.
Main part: (1 minute)
Creating a psychological environment: The teacher divides the students into two groups by telling them theorems and properties, and each group is given a name. 1st group Al-Beruni, 2nd group Al-Farghani. Each group will briefly talk about al-Beruni and al-Farghani, their works and works.
Then a common name for the lesson is chosen. This lesson is called "When Scholars Compete".
Teacher: By fulfilling the given conditions, we determine which group of students is strong in knowledge:
Condition 1. Pupils of each group answer the questions in the handouts:
What is a parallel straight line?
What is the perimeter of a triangle?
When are two straight lines parallel?
List the sections of geometry.
Providing information about didactic games. (2 minutes)
The topic covered by the video is explained by the teacher. (6 minutes)
New topic
Topic: Theorem about the sum of interior angles of a triangle
Theorem. The sum of the internal angles of a triangle is equal to 180 0.
We take an arbitrary triangle ABC and draw a straight line parallel to AC from its end B. < 1 = <4 , because these angles, a and AC are commutative angles formed by the intersection of the parallel straight lines with the transversal AB.
<3 = <5 because these angles, a and AC, are commutative angles formed by cutting the parallel straight lines AC with the bisector BC.
From this, <1 + <2 + <3 = 1800, i.e
Practical exercise. Students of three groups draw a triangle on paper and cut the angles separately and place them on a straight line. It can also be seen that the sum of the internal angles of the triangle is 1800 Students will complete the problems related to the topic.
2. In this, students complete "Mathematical Riddles":
Three girls are playing
As if an opened tulip.
Five of his friends came
Tell me, how many were there? (answer: 8 people)
Twelve branches on one tree
Three hundred and sixty-five leaves
One fat of the leaves is white
One oil is black
(answer: 12 months, day and night)
3. Under this condition, students draw the following shapes without lifting the pen from the paper and walking through the sections only once.
4. Test your knowledge?
In this obstacle, the participants of each group are given a puzzle with the same question. (6 minutes)
Condition 5. Do you know? In this condition, group participants are told information about a certain geometric shape by the teacher. Group participants find out which form the information belongs to. (6 minutes)
group: Square, right triangle, cube.
- All sides of this geometric shape are equal.
- This geometric shape has 3 sides, two sides are always perpendicular to each other.
group: Circle, parallelepiped, polygon.
- There will be no corners in this form.
-It has three dimensions, and the surface area formula is calculated using the formula S=2(ab+ac+bc).
Condition 6. Snowflakes with questions - quick answers to quick questions
In this, group participants are asked quick questions about the interior and exterior angles of a triangle, without time to think. (6 minutes)
1 group:
1. How many interior angles are there in a triangle?
Answer: three
2. How many exterior angles of a triangle can be acute?
Answer: one
2 group:
1. How many degrees is the sum of the interior angles of a triangle?
Answer: equal to 1800.
What about the sum of the exterior angles?
Answer: equal to 3600.
Evaluation criteria: (1 minute)
A 5-point desktop computer picture card is awarded for a correct and complete answer.
A 4-point notebook picture card is awarded for an incomplete answer.
A 3-point pocket computer picture card is awarded for an incorrect or incomplete answer.
At the end of the lesson, the group cards are counted and the winning group is announced
is done.
Homework:
Reread the previous topics, gather information about the topics and complete problem 9. (1 minute)
