# LESSON PLANNING OF USE PROTRACTOR

LESSON PLANNING OF USE PROTRACTOR TO CONSTRUCT ANGLES OF DIFFERENT MEASURES

Subject Mathematics

Students` Learning Outcomes

• Use protractor to construct, right angle, straight angler and reflex angles of different measures

Information for Teachers

• Consult text book at all steps where and when required.

Material / Resources

Writing board, chalk / marker, duster, geometry box, textbook

Introduction

• Ask students if they have seen sun rise or sun set?

• Draw a straight line on board and make half sun and ask how it looks at this time [show sample to the students].
• Tell them to open their geometry box and see if there is something resembling that.

• Let them explore that the shape of protractor resembles a half sun.
• Ask them to DRAW SUNRISE by using protractor, the way you drew on the board. [Show sample]
• Let them try, later helping them to draw on the board with the help of a protractor.
• Ask them to read and find total number of degrees on this D- shaped tool.
• May be they will answer 1800 or something else.
• Tell them that this is also an angle called straight angle.
• Tell the students that there are 1800 degrees in a straight angle. Ask students if they have ever heard the phrase “does a one-eighty”. It means to do things in opposite direction.
• Let them try to join two protractors in a way to complete a whole circle and then ask then count number of degrees it has.
• Let them explore that there are 3600 degree in a circle.

Development

Activity 1

• Recall the concepts of angles which they have already studied in Grade 4
• Conduct one or two activities from previous grade if you find necessary.
• This will help to create a link.
• Make angle 4 of 1800by the hands of the clock; make the figure then change 4 directions.
• Encourage students to get ready for the game: Do as I do?
• Attempt following steps on board and ask students to do the same individually.

• Place the center of protractor at a point A which is point O.
• Look for the number 1800on protractor and mark a point on the paper next to 1800
• Take away the protractor and label the point C.
• Join point A and new point C by using ruler.

• Relate the clock hands and angles that 12 0` Clock is a Zero degree angle and 6 0` Clock is 1800angle. [Change the direction of Minute and Hour hand to form new angle]

Sum up / Conclusion

• Ask students what they have learnt during the period about the angles.
• Student will answer that angle of 1800 is called straight angle.

• Reflex Angle is one which is more than 1800 but less than 3600

• Reflex angle is larger angle, whereas its smaller angle may be acute or obtuse.

Assessment

• Give angles of different degrees to the students and ask them to draw them and identify its type.

i.                    450

ii.                   1700

iii.                  900

iv.                  200

v.                   1800

vi.                  3600