Difference between revisions of "Triangles"
From wikisori
(New page: === Age === <br> === Materials === <br> === Preparation === <br> === Presentation === <br> === Control Of Error === <br> === Points Of Interest === <br> === Purpose...) |
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| Line 1: | Line 1: | ||
=== Age === | === Age === | ||
| − | <br> | + | 6-9.<br> |
=== Materials === | === Materials === | ||
| − | <br> | + | *Reading labels - "scalene triangle", "isosceles triangle", "equilateral triangle", "right-angled triangle", "obtuse- angled triangle", "acute-angled triangle"<br> |
=== Preparation === | === Preparation === | ||
| − | <br> | + | <br> |
=== Presentation === | === Presentation === | ||
| − | <br> | + | #Take out the first triangle in the first row. |
| + | #Invite the child to identify the three sides and observe whether the sides are alike or different. | ||
| + | #All three sides are different, this is a scalene triangle. | ||
| + | #Relate the story of the farmer and the ladder he used to pick fruit from his trees. | ||
| + | #Unlike the ladders we use today, the rungs of this ladder were all different lengths. | ||
| + | #These ladders are still used today in lesser developed countries. | ||
| + | #Just as all the rungs are different lengths, the sides of this triangle are all different lengths (scalene: Latin scala, usually plural scalae - ladder, flight of steps or Greek: skalenas - limping, uneven). | ||
| + | #Isolate the second triangle in the first row. | ||
| + | #Invite the child to carefully observe its sides - two are alike. | ||
| + | #This is an isosceles triangle (isosceles: Greek isos - equal, and sceles - legs; thus having equal legs). | ||
| + | #Here it means two equal legs, or sides. | ||
| + | #Isolate the third triangle. | ||
| + | #By observing and turning the inset in its frame, the child sees that all of the sides are the same. | ||
| + | #This is an equilateral triangle (equilateral: Latin aequus - equal, and latus, lateris - a side; thus having equal sides). | ||
| + | #Place the three insets on the table and do a three period lesson. | ||
| + | #Isolate the first triangle in the second row. | ||
| + | #Identify the right angle. | ||
| + | #This is a right angle, it is erect. | ||
| + | #This is a right-angled triangle. | ||
| + | # How many right angles does it have? Only one. | ||
| + | #Isolate the second triangle. | ||
| + | #Identify the obtuse angle. | ||
| + | #Obtuse means dull. | ||
| + | #This is an obtuse-angled triangle. | ||
| + | #Count the obtuse angles... only one. | ||
| + | #Isolate the third triangle. | ||
| + | #All of these angles are smaller than the right angle. | ||
| + | #They are acute angles. | ||
| + | #Acute means sharp, pointed. | ||
| + | #Feel how it is sharper than the right or obtuse angles. | ||
| + | #This is an acute-angled triangle. | ||
| + | #How many acute angles does it have? Three. | ||
| + | #Bring out the three triangles and review the first period. | ||
| + | #The triangle must have one right angle to be a right-angled triangle... and so on. | ||
| + | #Second and third periods follow. | ||
| + | #Give the child the reading labels.<br> | ||
=== Control Of Error === | === Control Of Error === | ||
| − | <br> | + | <br> |
=== Points Of Interest === | === Points Of Interest === | ||
| − | <br> | + | <br> |
=== Purpose === | === Purpose === | ||
| − | <br> | + | <br> |
=== Variation === | === Variation === | ||
| − | <br> | + | <br> |
=== Links === | === Links === | ||
| − | <br> | + | <br> |
=== Handouts/Attachments === | === Handouts/Attachments === | ||
| − | <br> | + | <br> |
| − | [[Category:Mathematics]] | + | [[Category:Mathematics]] [[Category:Mathematics_6-9]] |
Latest revision as of 04:04, 31 July 2009
Contents
Age
6-9.
Materials
- Reading labels - "scalene triangle", "isosceles triangle", "equilateral triangle", "right-angled triangle", "obtuse- angled triangle", "acute-angled triangle"
Preparation
Presentation
- Take out the first triangle in the first row.
- Invite the child to identify the three sides and observe whether the sides are alike or different.
- All three sides are different, this is a scalene triangle.
- Relate the story of the farmer and the ladder he used to pick fruit from his trees.
- Unlike the ladders we use today, the rungs of this ladder were all different lengths.
- These ladders are still used today in lesser developed countries.
- Just as all the rungs are different lengths, the sides of this triangle are all different lengths (scalene: Latin scala, usually plural scalae - ladder, flight of steps or Greek: skalenas - limping, uneven).
- Isolate the second triangle in the first row.
- Invite the child to carefully observe its sides - two are alike.
- This is an isosceles triangle (isosceles: Greek isos - equal, and sceles - legs; thus having equal legs).
- Here it means two equal legs, or sides.
- Isolate the third triangle.
- By observing and turning the inset in its frame, the child sees that all of the sides are the same.
- This is an equilateral triangle (equilateral: Latin aequus - equal, and latus, lateris - a side; thus having equal sides).
- Place the three insets on the table and do a three period lesson.
- Isolate the first triangle in the second row.
- Identify the right angle.
- This is a right angle, it is erect.
- This is a right-angled triangle.
- How many right angles does it have? Only one.
- Isolate the second triangle.
- Identify the obtuse angle.
- Obtuse means dull.
- This is an obtuse-angled triangle.
- Count the obtuse angles... only one.
- Isolate the third triangle.
- All of these angles are smaller than the right angle.
- They are acute angles.
- Acute means sharp, pointed.
- Feel how it is sharper than the right or obtuse angles.
- This is an acute-angled triangle.
- How many acute angles does it have? Three.
- Bring out the three triangles and review the first period.
- The triangle must have one right angle to be a right-angled triangle... and so on.
- Second and third periods follow.
- Give the child the reading labels.
Control Of Error
Points Of Interest
Purpose
Variation
Links
Handouts/Attachments
