Difference between revisions of "Constructive Triangles: Second Box: Trapezoid"
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> | + | Box 2 - |
+ | |||
+ | *Two blue equilateral triangles | ||
+ | *Two blue right-angled isosceles triangles | ||
+ | *Two blue right-angled scalene triangles | ||
+ | *One blue obtuse-angled scalene triangle | ||
+ | *One blue right-angled scalene triangle (corresponds to the red triangle from Box 1)<br> | ||
=== Preparation === | === Preparation === | ||
− | <br> | + | <br> |
=== Presentation === | === Presentation === | ||
− | <br> | + | #With the two small red triangles, invite the child to unite the triangles along the black lines and identify the figure obtained - a trapezoid. |
+ | #Using the two corresponding blue triangles, invite the child to form the figure which he already knows and to identify it - a trapezoid. | ||
+ | #Continue making other quadrilaterals using only the obverse sides. | ||
+ | #The directress identifies the figure obtained. | ||
+ | #Since it has four sides we can call it a quadrilateral. | ||
+ | #It is a concave quadrilateral - a boomerang (it may also be called a re-entrant). | ||
+ | #Invite the child to turn over one triangle to form any other figures, quadrilaterals or triangles. | ||
+ | #The quadrilateral is called a common quadrilateral. | ||
+ | #The triangle is an obtuse-angled isosceles triangle. | ||
+ | #Note: This triangle has great importance in the later study of the area of a trapezoid. | ||
+ | #Recall the figures formed by these triangles; there are four.<br> | ||
=== Control Of Error === | === Control Of Error === | ||
− | <br> | + | <br> |
=== Points Of Interest === | === Points Of Interest === | ||
− | <br> | + | <br> |
=== Purpose === | === Purpose === | ||
− | <br> | + | *Exploration of the triangle as the constructor of triangles and quadrilaterals.<br> |
=== Variation === | === Variation === | ||
− | <br> | + | <br> |
=== Links === | === Links === | ||
− | <br> | + | <br> |
=== Handouts/Attachments === | === Handouts/Attachments === | ||
− | <br> | + | <br> |
− | [[Category:Mathematics]] | + | [[Category:Mathematics]] [[Category:Mathematics_6-9]] |
Revision as of 04:25, 31 July 2009
Contents
Age
6-9.
Materials
Box 2 -
- Two blue equilateral triangles
- Two blue right-angled isosceles triangles
- Two blue right-angled scalene triangles
- One blue obtuse-angled scalene triangle
- One blue right-angled scalene triangle (corresponds to the red triangle from Box 1)
Preparation
Presentation
- With the two small red triangles, invite the child to unite the triangles along the black lines and identify the figure obtained - a trapezoid.
- Using the two corresponding blue triangles, invite the child to form the figure which he already knows and to identify it - a trapezoid.
- Continue making other quadrilaterals using only the obverse sides.
- The directress identifies the figure obtained.
- Since it has four sides we can call it a quadrilateral.
- It is a concave quadrilateral - a boomerang (it may also be called a re-entrant).
- Invite the child to turn over one triangle to form any other figures, quadrilaterals or triangles.
- The quadrilateral is called a common quadrilateral.
- The triangle is an obtuse-angled isosceles triangle.
- Note: This triangle has great importance in the later study of the area of a trapezoid.
- Recall the figures formed by these triangles; there are four.
Control Of Error
Points Of Interest
Purpose
- Exploration of the triangle as the constructor of triangles and quadrilaterals.
Variation
Links
Handouts/Attachments