LESSON PLANNING OF TYPES OF ANGLES

 

LESSON PLANNING OF TYPES OF ANGLES

Subject Mathematics

Grade 5th

Students` Learning Outcomes

  • Recall an angle and recognize acute, right, obtuse, straight and reflex angles.

Information for Teachers

  • The word angle is derived from the Latin word angulus, meaning “a corner”.
  • In geometry, an angle is the figure formed by two rays, called the sides of the angle.
  • Acute, right, obtuse, straight and reflex angle are few of six types of angles.
  • An angle whose measures less than 900 is called acute angle.

 

  • An angle whose measure is exactly 900is called right angle.

 

 

  • An angle whose measure is greater than 900and less than 1800 is called obtuse angle.

 

 

  • An angle whose measure is exactly 1800is called straight angle [] straight line]

 

 

  • An angle whose measure is greater than 1800and less than 3600 is called reflex angle.

 

 

Material / Resources

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

Introduction

  • Take out your geometry box along and ask what is it?
  • What is a geometry box?

 

  • What is geometry?

 

 

  • Why is geometry important?

 

 

  • Ask students to think about why geometry is important in the “real world”. Write down any ideas that surface in the discussion; make sure that students are talking on the topics of art, architecture and engineering.

 

Development

Activity 1

  • Provide one paper per student [try to get a better quality paper if possible]
  • Ask students to fold it from middle and draw a line between.
  • Label one column as KEY-WORD and other as I-KNOW.
  • Draw horizontal lines so that they can write later.
  • On outer side of the folded paper write ‘My Geometry Dictionary’ and your name.
  • Show your personal geometry dictionary to the students and encourage them while writing new word after learning.
  • Every word that students put in their dictionary will also be written on the board.
  • Draw few figures, on the board, taken from Grade 4 lessons, ask students to discuss amongst each other and collect each group`s feedback verbally and produce the correct concept on board. For example;

o   Alphabets ‘V’ has …………………….angle whereas ‘L’ has …………. Angle.

o   Can you draw 120 degree angle by using protractor?

o   What is the angle between hours and minutes hands when it is 6 o`clock, 3 o`clock, 5 o`clock and 2 o`clock etc.

  • Divide the class in groups and let them find answers, this will help recall taught concepts.

Sum up / Conclusion

  • Windup today`s lecture by repeating key points learned today.
  • Acute, right, obtuse, straight and reflex are the types of angle.
  • An angle is the figure formed by two sides.
  • Angle less than 900 is called acute angle.
  • An angle of 900 is called right angle.
  • Greater than 900 and less than 1800 angle are called obtuse angle.
  • Angle of exactly 1800 is called straight angle.
  • Angle greater than 1800 and less than 3600 is called reflex angle.

 

Assessment

  • Assign following question to the students to assess them.
  • Draw the following table on the board and call students one by one and ask them to link the name of the angle with its properties.

 

Follow up

  • Assign homework to further strengthen their concepts regarding angles, e.g.
  • o   Ask the students to observe your home and point out different items at which you think form one of the angle that you read in the class.
  • o   Give them hint like, corner of TV that forms right angle (900)

 

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