Subject : Mathematics

Topic : Triangles ( Isosceles and Equilateral Triangles)

Level : Primary 5

Duration : 3 periods

Pupils are able to state that

• the sum of the angles of a triangle is 180 ;
• angles on a straight line is 180 ;
• the exterior angle of a triangle is equal to the sum of the interior opposite angles

Pupils are able to

• recognise that the angles opposite the equal sides of a triangle are equal ;
• identify and name isosceles and equilateral triangles ;
• find unknown angles in simple problems involving isosceles triangles and equilateral triangles

Identifying main ideas/concepts

1. Title of Courseware : Zarc’s Primary Mathematics Adventure 5B
2. Workbook : Primary Mathematics 5B, Exercise 41, 42 & 43
3. Straws of 2 different lengths ( 8cm and 10 cm)

Full computer laboratory

1. Teacher gets pupils to form groups of fours. Then, get the pupils to use straws of two different

lengths to make triangles. Pupils record their responses on their notebook.

2. Teacher asks, " How many different triangles can you make with the straws?" Teacher then records the different responses on the whiteboard.
3. Teacher asks, " Which triangles have two equal sides?" and " Which triangles have three

equal sides?" Teacher elicits the names of such triangles from the pupils.

4. Teacher gets pupils to list some of the properties they already know about such above triangles. Then teacher informs pupils that they will use the courseware, " Zarc’s Primary Mathematics Adventure 5B" to (I) find out more about these two triangles and (II) to solve simple problems involving such triangles.
5. Teacher demonstrates how to sign-in :

-- At the Kid’s Desk, look for " Zarc’s ….5B" and click on it

-- Type name and click on the button with the green hand

-- After Prince Zarc’s introduction, click on him

-- On the map, select "Triangles" and then " Isosceles and Equilateral Triangles"

-- Then, click on "Presentation" to complete the first task (i.e. to find out more about the isosceles

triangles and equilateral triangles) and record the information on their notebook

-- To listen to the presentation again, select either "1", "2" , "3" or "4" for the different part of the

presentation

-- Then, click on "Close"

-- Select "Exercise" and teacher demonstrates and discuss the first two problems with the class

6. Teacher gets the monitors to collect the coursewares and gets the pupils started on the tasks
7. Teacher gets pupils to do Workbook Ex. 41, 42 and 43 as a follow-up activity.

2. Type your name and click on the button with the green hand

3. After Prince Zarc’s introduction, click on him

4. On the map, select "Triangles" and then " Isosceles and Equilateral Triangles"

5. Then, click on "Presentation" to complete the first task (i.e. to find out more about the isosceles

triangles and equilateral triangles) and record the information on your notebook

6. To listen to the presentation again, select either "1", "2" , "3" or "4" for the different part of the

presentation you want to listen to again

7. Then, click on "Close"

8. Select "Exercise" and key in your answer in the box

9. Click on the button with the green arrow pointing to your right to check whether your answer is

correct

10. Click on the arrow again to go on to the next question (there are altogether 6 questions in a set)

11. To try on more questions if you have completed the required tasks, click on "Close" and select

"Exercise" again