LESSON PLAN
Educational unit : SMP Negeri 26 Surabaya
Subject : Mathematics
Grade : VII
Semester : 2
Time Allocation : 2 x 40 menit
A. Standart of competence.
Understanding between lines, line and angle
B. Basic of competence.
Measuring the size of an angle, determining the kinds of angles, and drawing an angle
C. Indicator.
1. To determine the right angle, if given angles by using the right angled paper.
2. to perform addition and subtraction in sexagesimal unit of angular measurement.
D. Leaning abjectives.
1. Students should be able to determine the right angle, if given angles by using the right angled paper.
2. Students should be able to perform addition and subtraction in sexagesimal unit of angular measurement.
E. Tools and materials.
1. Power point and LCD
2. Paper
F. Instructional sources.
1. Student book
2. Student work sheet
G. Learning model and methods.
Teaching and learning model : Cooperative learning
Method : Discussion, questioning and Task
H. Teaching and learning activities.
| PHASES | ACTIVITIES | IMPLEMENTATION |
| Introduction (5 minutes) | 1. The teacher inform the indicators and learning objectives (phase 1) 2. Teacher motivates student by tell to student about the connection angle in daily life problems, is : a person wants to find the width of a river without | Done / not Done / not |
| | Having to measure it directly since direct measurement would require that person to go a cross the river. Do you know how to measure the width of the river without having to go across it ? | |
| Main activities (65 minutes) | 1. By using power point, teacher explains to student about angle and giving some examples operation of addition and subtraction of angle in sexagesimal unit 2. Teacher asks student to joint to their group. (phase 3) 3. Teacher gives the work sheet and guide the student the students to do the exercise (phase 4) 4. Some group are asked to present the results of their group discussion, whise the other group respond it (phase 5) 5. Teacher gives a reward to the group are present their work (phase 6) | Done / not Done / not Done / not Done / not Done / not |
| Closing (10 inutes) | 1. Teacher guides the student to summarize the lesson about angle 2. Teacher gives stuedents a home work to be done the exercise page 30 on Erlangga book I-B | Done / not Done / not |
I. Assesment.
Type a assesement : written test
Instrument form : Essay
Example of instrument :
Evaluation :
1. Look at the following figure :
| .C |
| .B |
| .A |
| .E |
| .D |
| .H |
| .G |
| .F |
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a. Using three letters, name all the angles !
b. Mention the angles which can be called as right angles (by using the right angled paper)
2. Find the result of the following additions and subtraction !
a. 36° 12' 45" - 42° 16' 29" + 28° 16' = ..............
b. 15° 27' 34" + 74° 29' 43" + 35° 44' = .............
c. 76° 25' 16" + 14° 19' 24" - 56° 42' 45" = .............
Solution of evaluation
Worksheet :
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Learning objectives :
· Students should be able to name angles
· Students should be able to express the result of addition and subtraction angle in degree
· Students should be able to perform addition subtraction angle in sexagesimal unit
Do this following question .
1. Denote the following angles using three letters and find the number of angles which be formed :
a. b.
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| .A |
| .C |
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| .B |
| .D |
| .P |
| .Q |
| .S |
| .R |
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- Express the result of the folling addition and substraction in degrees !
a. 21° 15' + 43° 27' = (.............. + ...............) ° + (............ + ...............) '
= ............... ° ............. '
= .................... °
b. 10° 28' + 56° 17' = (.............. + ...............) ° + (............ + ...............) '
= ............... ° ............. '
= .................... °
- Determine the result of :
a. 3° 15' 40" + 20° 10' 20" =
= (.............. + .............) ° + (............ + ..............) ' + (............. + ..............) "
= ............ ° ............. ' ............ "
= ............ ° ............. ' ............ "
b. 49° 15' - 36° 30' = (............°(60 + ............)') - (............° .............. ' )
= ( ............. - ..............)° + ( ............. - ............. )'
= ...............° .............'
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