1. LESSON PLAN
SCHOOL : SMP Negeri X Palembang
SUBJECT : Mathematics
CLASS/SEMESTER : IX/1
TIME ALLOCATION : 1 x 40 minutes
A. Standard Competency
1. Understanding similarity in plane figures and using it in problem solving
B. Basic Competency
1.1 To indentify similarity and congruency plane figures
C. Learning Objectives
Students will be able to :
Determine the definition of similarity
Determine the definition of congruency
Determine the requirements for similarity
Determine the requirements for congruency
D. Learning Material
The properties of similar things
The properties of congruent things
E. Learning Method and Model
Method :
Discussion
Question and answer
Giving task
Approach :PendidikanMatematikaRealistik Indonesia
F. Learning Activity
Appearance character : Cooperative
1. Opening
a. Apperception
Teacher ask the students to remind again about the shapes by playing the video about
that
b. Motivation
Teacher inform the students the advantage of the similar and congruent in daily life
c. Goals
Teacher tell the students the goal of the similarity and congruency
2. Main Activity
a. Exploration
Students are grouped of 3or 4

2. Students are Given many pieces of paper
Teacher guide the students to cut the paper into many new things that contains
similar or dissimilar and congruent or incongruent
Each group discusses the properties of similarity and congruency, from the
paper
b. Elaboration
One group present the result of the discussion and the othe groups give the
response
From the discussion, students can conclude the properties of similarity and
congruency
Teacher guide the students to find the requirements of simmilarit and
congruency
c. Confirmation
Students mention some things around them that are similar or dissimilar and
congruent or incongruent
3. Closing
a. Students are asked to speak obout this lesson
b. Students are directed to make a summary
c. Students are given homework
d. Teacher inform students what will learn in the next meeting
G. Learning Source
Directorate of junior high school development.Mathematics for Junior High School Year
IX Studentt Book. Jakarta
Acknowledgment Palembang, May 2012
Principal of SMP Negeri X Palembang Mathematics Teacher
Dr. Abecede, S.Pd.,M.Pd. Abduh, S.Pd., M.Ed.
NIP. 19581207199811 1 001 NIP. 19920701201012 1 001