down the important materials in their writing book.
2.5 Teacher gives problems that related
to the
relationship between central angle, inscribed
angle, length of arc, and area of sector.
zone of
proximal development
2.6 Teacher guides students to understand
the problems.
scaffolding 2.7 Teacher guides students to see
how the various items are connected, and make a plan to
solve the problems. scaffold- ding
2.8 Teacher guides students to carry out the plan. scaffolding
2.9 Teacher guides students to look back at the completed solution.
scaffolding
Phase 3. Organize students into
learning teams 5’
3.1 Teacher organizes students into
learning teams,
each team
consist two students. 3.2 Teacher gives a paper that
contains 9 square horay card to each team and asks them to fill
the horay card with numbers 1-9 by randomly.
3.3 Teacher gives problems about relationship
between central
angle, inscribed angle, length of arc, and area of sector by
randomly using PowerPoint. zone of proximal development
Phase 4. Assist team work and study
25’
4.1 Teacher
asks students
to understand
the problem.
Understand the problems
Make a plan
Carry out the plan
Look back
Understand the problems
Make learning
teams Make
horay card
Give problems
Discussion
Elaboration
Elaboration
Elaboration
Elaboration Elaboration
Elaboration
Elaboration
scaffolding 4.2 Teacher asks students to see how
the various items are connected, and make a plan to solve the
problems. scaffolding
4.3 Teacher asks students to carry out the plan. scaffolding
4.4 Teacher asks students to look back at the completed solution.
scaffolding 4.5 If time is up then students are
asked to write the final answer in horay card.
Phase 5.
Test on the materials 5’
5.1 Teacher offers students to present the solution in front of class.
5.2 Teacher corrects the solution of the problems and every team
with correct answer must fill the horay card by a true sign O
and the others fill by cross sign X.
5.3 Students who have mark O form as
vertical, horizontal,
or diagonal must shout horay.
5.4 Teacher gives stars to the teams that get true sign O shaped
verticalhorizontaldiagonal line. 5.5 Teacher counts the number of
correct answer and star which was gotten by each group.
Phase 6.
Provides recognition 3’
6.1 Teacher gives reward to the teams
that get the most star. Make a plan
Carry out the plan
Look back
Fill with true or
cross sign
Shout “horay”
Appraisal
Give reward
Elaboration
Elaboration
Elaboration
Confirmation
Confirmation
Confirmation
Confirmation
Confirmation
Closing Activity 8‟
a. Teacher guides students to make a conclusion about the materials
that they are learnt. b. Teachers reflects the learning
today c. Teacher gives homework.
d. Teacher informs that we will learn about how to determine the
length of arc, area of sector, and area of segment for the next
meeting.
e. Teacher closes the meeting by greeting.
H. Learning Media and Sources
Media : Whiteboard, board marker, eraser, mathematics model,
computer, LCD, and power point. Reference : Mathematics book grade VIII semester 2
I. Assessment
1. Technique : Writing Test, homework
2. Form of test : Essay
Ungaran, January 2013 Researcher
Eli Pri Mahanani NIM 4101409101
LESSON PLAN EXPERIMENT CLASS
School : SMP Negeri 1 Ungaran
Subject : Mathematics
ClassSemester : VIII2
nd
Time Allocation : 2 x 40 minutes 2
nd
meeting
A. Standard competence
4. Determining the element of circle, its parts and its size.
B. Basic competence
4.3 Applying the relationship of central angle, the length of the arc and area of sector.
C. Indicators 4.3.2 Determining the length of arc, the area of sector and the area of segment.
D. Learning Objectives
1. Students are able to determine the length of arc. 2. Students are able to determine the area of sector.
3. Students are able to determine the area of segment.
E. Learning Materials
b. The relationship of central angle, inscribed angle, length of arc, and area of sector
