Assessment Scoring Guide:
Interval score every dimensions: 75 – 95.
H. Learning Sources
Adinawan, M. Cholik dan Sugijono. 2007. Seri Pendalaman Materi Matematika SMP dan MTs. Jakarta: ESIS.
Adinawan, M. Cholik dan Sugijono. 2009. Math for Junior High School 2nd Semester Grade VIII. Jakarta: Erlangga.
Environment.
a. Exploration :
1. The students are divided into pairs, every group consist of 2 heterogeneous students, one as problem solver PS and the other as listener L.
2. Teacher gives worksheet to each group to get the value of π and find the
formula for the circumference of a circle. 3. Every student in their group determine the value of
π and the formula for the circumference of a circle.
4. Teacher guides students the way to get the value of π and find the formula for
the circumference of a circle. 5. Teacher gives example.
b. Elaboration :
1. Teacher gives different problems in worksheet to PS and L about circumference of a circle in a problem solving.
2. PS and L learn their problem for 5 minutes. 3. PS read the problem and tell the L the step to conclude the problem.
4. L observing the problem solving process, ask if there is something less
understood, or provide direction and guidance if PS had difficulty. 5. Teacher went around the classroom to observe and help smooth discussions.
6. After the first problem is solved, PS and L swapped roles and conduct discussions back as above.
7. One of group present the task in front of class. 8. The discussion of the two problems that have been given.
9. Teacher give reward to the best group.
c. Confirmation :
1. The students are given confirmation about the material if there are some misconception.
Closing
1. Students are guided by teacher make conclusion. 2. Students are given homework by teacher exercises on students book.
No Name
Class Group
Dimensions Categories Average
Neatness True or
False
I. Assessment
Guidelines for Scoring:
Indicator Technique
Type of Instrument
Examples
1. To determine the value of phi.
2. To determine the circumference of a
circle. Written test
Written test Worksheet
Worksheet 1. The comparison value of
circumference K
and diameter d of circle is
called... The value of phi is ... or ....
2. A motorcycle wheel of radius 35 cm will lead the
way as far as 2.2 km. How many
times the
wheel spins?
ቀߨ =
ଶଶ
ቁ 3. The circumference of a
motorcycle wheel is 132 cm.
Determine:
a. the length of radius of motorcycle wheel, and
b. the length of the track made by motorcycle
wheel if it rotates 100 times.
No. Key
Score
1. The comparison value of circumference K and diameter d of
circle is called phi.
The value of phi is
ଶଶ
or 3.14. 2
3
Total score 5
2. Memahami Masalah
Given: Radius of wheel r = 35 cm
Distance D = 2.2 km = 220,000 cm
Asked: The number of wheel spins.
Merencanakan penyelesaian pemecahan masalah Answered:
The circumference of wheel K = 2
ߨݎ 1
1
2
ܭ = 2ߨݎ = 2 ×
22 7
× 35 The number of wheel spin
݊ =
Melaksanakan rencana pemecahan masalah
= 220 cm ݊ =
=
ଶଶ, ଶଶ
= 1,000. So, the wheel spins 1,000 times.
1
1 1
1 1
1
Total score 10
3.
ݎ = 132
2 × 22
7 =
132 44
7 =
132 × 7 44
= 21
Memahami Masalah Given:
Circumference of wheel K = 132 cm The number of wheel rotates n = 100
Asked: The radius of motorcycle’s wheel and the length of the
track made by motorcycle.
Merencanakan penyelesaian pemecahan masalah Answered:
The circumference of wheel K = 2
ߨݎ ⟺ ݎ =
ଶగ
The length of track ܦ = ܭ × ݊
Melaksanakan rencana pemecahan masalah
ܦ = 132 × 100 = 13,200. So, the radius of motorcycle’s wheel is 21 cm and the length of
the track made by the bicycle wheel if it rotates 100 times is 13,200 cm.
1 1
2 1
3
1 1
Total score 10
Mark = total score × 0.4
Known, Mathematics Teacher
Arif Dewantoro, S.Pd. NIP. -
Pekalongan, January 8
th
2013 Researcher
Nikmatul Maula NIM. 4101409067
LESSON PLAN 2 Experiment Class
SCHOOL UNIT : SMP N 2 Pekalongan
SUBJECT : Mathematics
GRADE SEMESTER : VIII2
TIME ALLOCATION : 2 x 40 minutes
A. Standard of Competence
4. Determine the elementes of a circle, parts of a circle and the measures
B. Basic Competence
4.2 To find the circumference and the area of a circle
C. Indicators
1. To determine the area of a circle
D. Learning Objectives
1. Students able to determine the area of a circle
E. Learning Materials
Chapter 6 Circle
F. Approach, Method, and Model of Learning
1. Approach : Contextual Teaching and Learning
2. Methods : Lecture, discussion, and question and answer
3. Model : Think Aloud Pair Problem Solving TAPPS
G. Learning Activity Opening
1. Apperception:
Teacher says greeting and makes sure whether the students are ready. Teacher brings the equipment to prove the area of circle.
Teacher reminds students the way to get the value of
π.
Teacher reminds students the formula for the circumference of a circle. 2. Motivation
Teacher tells students some topics in daily life related with the area of circle such as roll.
Main Activity a. Exploration :
1. The students are divided into pairs, every group consist of 2 heterogeneous students, one as problem solver PS and the other as listener L.
2. Teacher gives worksheet to each group to find the formula for the area of a circle.
Assessment Scoring Guide:
Interval score every dimensions: 75 – 95.
H. Learning Sources
Adinawan, M. Cholik dan Sugijono. 2007. Seri Pendalaman Materi Matematika SMP dan MTs. Jakarta: ESIS.
Adinawan, M. Cholik dan Sugijono. 2009. Math for Junior High School 2nd Semester Grade VIII. Jakarta: Erlangga.
Environment. 3. Every student in their group determine the formula for the area of a circle.
4. Teacher guides students the way to find the formula for the area of a circle. 5. Teacher gives example.
b. Elaboration :
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