LESSON PLAN Educational Unit
: Junior High School
Grade/Semester
: VII/II
Subject
: Mathematics
Allocation of Time
: 2 x 40 minutes
A. Standard Competence GEOMETRY 6. Understanding the concept of quadrilateral and triangle and determining the measure. B. Basic Competence 6.1 Identifying the properties triangle by the sides and angles. C. Indicators 1.
Explain the types of triangle by the sides. a) Identifying types of triangle based on the length of the side are that equilateral triangle, isosceles triangle, and scalene triangle. b) Classifying types of triangle based on the length of the side are that equilateral triangle, isosceles triangle, and scalene triangle.
2.
Explain the types of triangle by the angles. a) Identifying types of triangle based on the size of the angle are that acute triangle, right triangle, and obtuse triangle. b) Classifying types of triangle based on the size of the angle are that acute triangle, right triangle, and obtuse triangle
D. Learning Objectives 1. Students are able to identify and classify the types of triangle by length of the sides. 2. Students are able to identify and classify the types of triangle by the size of the angle. 3. Students can apply their knowledge about triangle in solving problem related to characteristics of triangle. E. Learning Activities : Learning Approach
: Indonesian Realistic Mathematics Education (IRME)
Learning Method
: Lectures, discussion, and assignment
Learning Media
: Computer based, LCD, and wireless based.
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F. Learning Teaching Activity Teacher
Students
Introduction 1. Apperception: remind the student about
Time 10 minutes
Students give respond and a
the lesson in the last meeting
bit explanation about the properties of rectangular
2. Goal : Teacher informs the students that
Students give attention for the
they are going to learn about understanding the types of triangle
teacher explanation Students listen the explanation
3. Teacher gives motivation to the students
the teacher
with explanation how important to study it Main Activity
60 minutes
Exploration 1. Students are divided into small group
Students sit in their own group
2. Teacher gives the worksheet and the triangle cards. 3. Teacher asks students to work Activity 1 in Students work their worksheet group just for the first number.
in each group
4. Teacher guides the students while they are working in group. 5. Teacher asks every group to explain and
Students give explanation of their work
give the reason of their work in front of the class what based they classify it on. 6. Teacher guides students to identify and classify the types of triangles. 7. Teacher introduces the name of triangle by
Students pay attention of teacher explanation
its properties. Elaboration 8. Teacher asks students to work Activity 1
Students work in their each group
in group just for the second number. 9. Teacher asks every group to explain the definition each type of triangles.
Students present and give explanation of their work
10. Teacher shows and explains the various of triangle by showing the pictures and definition that are taken from a website http://mathsisfun.com/triangle.html
Students pay attention of
11. Teacher introduces the combining names
teacher explanation
of triangle. Created by. Dewi Hamidah |
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12. Teacher asks students to work Activity 1 Students work in their each in group just for the third number and
group
present their work. Confirmation 13. Students are asked to work Activity 2 in Students present and answer
group. 14. Teacher guide the students answering the
the worksheet in Activity 2
question. 15. Each group presents their work. Closing
10 minutes
1. The teacher guides the students to make a Students make a conclusion summary of the learning material they have learned. 2. Teacher gives the individual test to know Students work the individual about students’ understanding the material.
test
3. Teacher gives homework and remedial (if needed). G. Lesson Instrument and Source 1. Instrument : Triangle Card, and Worksheet 2. Source : Textbooks H. Assessment the Result of Learning Indicators Achievement of Competence Explain the types of triangle by the length of the sides Explain the types of triangle by the size of the angle
Technique Discussion
Assessment Instrument Instrument/Worksheet Form Explanation
Verbal and Non Verbal Test
Explain the types of triangle by the sides and give the example with picture Explain the types of triangle by the size of angle and give the example with picture
Palembang, ……………………. 2012 Principal,
(……………................................) NIP.
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Mathematics Teacher,
(…………………………………..) NIP.
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Additional Material Teacher shows the various types of triangle on a website as a media.
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Teacher shows the proof of the sum of angle is 180-degree.
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