OBJECTIVES: To classify triangles using criteria such a ...
OBJECTIVES: To classify triangles using criteria such as equal sides and equal angles.
To know some properties about triangles such as the measure of its angles. |UNIT: 2
LESSON: 3 | |
|FOCUS: Classifying triangles and measuring. | |
|COMMUNICATION |
|LANGUAGE OF LEARNING |LANGUAGE FOR LEARNING |LANGUAGE THROUGH LEARNING |
|Vocabulary of the topic |Language instruction |Language that comes through the lesson |
| |Start playing a domino game (worksheet 2.4). | |
|Vocabulary U2 L1, U2 L2(start) |Ask children, in groups of two, to reproduce on the geoboard all the possible triangles and draw them on| |
|regular/irregular polygons |the dot paper. | |
|circle |Encourage children to discuss about possible ways to classify triangles. | |
|semi-circle |Ask them to look carefully at their booklet for U2 L3 and listen to the teacher’s explanation. | |
|oval |Ask children to cut out the triangles and stick them in the right place (worksheet 2.5). | |
|triangle |Draw a triangle on a piece of paper and rips off the three corners. | |
|pentagon | | |
|hexagon | | |
|heptagon | | |
|octagon | | |
|two-dimensional | | |
|shape | | |
|flat | | |
|straight lines | | |
|curved lines | | |
|closed figures | | |
|vertex/vertices | | |
|side | | |
|angle | | |
|polygon | | |
|convex | | |
|concave | | |
| | | |
|Triangles’ classification(main teaching) | | |
|Right-angle | | |
|Obtuse | | |
|Acute | | |
|Isosceles | | |
|Scalene | | |
|Equilateral | | |
| | | |
|Measuring vocabulary(ending) | | |
|Protractor | | |
|Degrees | | |
|Sum | | |
| |Questions for learning |Sentences for answering | |
| |What can you say about triangles,..? |A triangle …… | |
| |How can you classify triangles? |Depending on the sides/on the angles | |
| |How can you be sure if two triangles you drew are |Probably measuring them/ cutting and overlap them. | |
| |equal? |No, because…….. | |
| |Did you find any concave? Why? |No, I didn’t. Because it would not be a triangle. | |
| |Did you find any triangle with two right-angles? |No, there isn’t. . Because it would not be a | |
| |Why? |triangle. | |
| |Is there any triangle with two obtuse angles? Why? |Yes, there is. Because we can draw a three side | |
| |Is there any triangle with three acute angles? Why? |shape with three acute angles. | |
| |What’s the sum of the3 angles? |It can be…….. | |
| |Language to express conclusions | |
| |“A triangle has 3 sides and 3 angles.” | |
| |“A triangle cannot have 2 right angles or 2 obtuse angles, but it can have 3 acute angles.” | |
| |“The sum of the three angles of a triangle is always 180º.” | |
| | | |
| |Triangles’ classification: | |
| |When looking at the lengths of sides: | |
| | | |
| |“Equilateral Triangle: A triangle having all three sides of equal length. The angles of an equilateral | |
| |triangle all measure 60 degrees. | |
| |Isosceles Triangle: A triangle having two sides of equal length. | |
| |Scalene Triangle: A triangle having three sides of different lengths.” | |
| |When looking at the size of the largest internal angle: | |
| |“Acute Triangle: A triangle having three acute angles. Obtuse Triangle: A | |
| |triangle having an obtuse angle. One of the angles of the triangle measures more than 90 degrees. | |
| |Right angle Triangle: A triangle having a right angle. One of the angles of the triangle measures 90 | |
| |degrees. “ | |
|RESOURCES: Booklet U2 L1, Booklet U2 L3, geoboard, elastic bands, dot paper, scissors, glue, worksheets: 2.4,2.5,2.6,, Power Point, websites. |
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