LESSON PLANNING OF TYPES OF ANGLES

Subject Mathematics

Grade 5^{th}

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 90
^{0 }is called acute angle.

- An angle whose measure is exactly 90
^{0}is called right angle.

- An angle whose measure is greater than 90
^{0}and less than 180^{0}is called obtuse angle.

- An angle whose measure is exactly 180
^{0}is called straight angle [] straight line]

- An angle whose measure is greater than 180
^{0}and less than 360^{0}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 90
^{0}is called acute angle. - An angle of 90
^{0 }is called right angle. - Greater than 90
^{0}and less than 180^{0}angle are called obtuse angle. - Angle of exactly 180
^{0 }is called straight angle. - Angle greater than 180
^{0}and less than 360^{0}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 (90
^{0})