# Rectangular Box 1

From wikisori

## Contents

### Age

3-5 years

### Materials

- Four isosceles right triangles, equal in size.
- Two green triangles with black lines on the hypotenuse, and two yellow triangles with black lines on the equal sides.
- Six scalene right triangles equal in size.
- Two grey triangles with a black line on the hypotenuse.
- Two green triangles with a black line on the longer side that describes the right angle.
- Two yellow triangles with a black line on the shorter side that describes the right angle.
- Two yellow equilateral triangles with a black line on one side.
- One red scalene right triangle with a black line on the longer side that describes the right angle.
- One red scalene obtuse triangle with a black line on the side opposite the obtuse angle.

### Preparation

This is an individual exercise, which may be done on a neutral colored rug. (Note: Work cycle to be observed).

### Presentation

- Invite the child to work with the 'rectangular box'.
- Show the child where the rectangular box is located on the shelf.
- When the child has made the selection of the material, begin with the third step after naming the material for the child.
- Indicate the procedure for carrying the material: one hand on each side of the rectangular box with thumbs on top and fingers on the bottom.
- Place the box in the upper left side of the rug.
- Remove the lid and place to the right of the box.
- Say, "I will make shapes from the triangles."
- Remove from the box the two green and two yellow isosceles triangles one at a time and place them in a straight line at the bottom of the rug.
- With the index and middle fingers, trace the black lines on the green triangles.
- Slide them together, forming a square.
- Move the square below the rectangle box.
- With the index and middle fingers, trace the black lines on the yellow triangles.
- Slide them together, forming a rhomboid.
- Move the rhomboid to the right of the square.
- Select from the box ,the two grey, two green, and two yellow scalene right triangles one at a time and place them in a straight line at the bottom of the rug.
- Trace the black line on the grey triangles.
- Slide them together, forming a rhomboid.
- Trace the black line on the yellow triangles.
- Slide them together, forming a rhomboid.
- Select from the box the two yellow equilateral triangles and the red scalene triangles one at a time and place them in a straight line at the bottom of the rug.
- Trace the black line on the two yellow triangles.
- Slide them together, forming a rhombus.
- Trace the black line on the red triangles.
- Slide them together, forming a trapezoid.
- Replace the material into the box beginning with the trapezoid to the lower left, rhombus in upper left, right angle triangles in right as rectangles, and isosceles triangles as a square.
- Return the material to the shelf in the manner as indicated in #3.

### Control Of Error

Visual. Black guidelines and colored triangles.

### Points Of Interest

Touching and mapping black lines. Mixing and pairing the triangles. Working with an increasingly larger assortment of triangles. Naming the equilateral figures formed by the triangles.

### Purpose

- To show the equilateral figures formed by various triangles.
- Refinement of perception.
- Development of concentration, order, coordination, and independence.
- Respond to the sensitive need for order in the child.
- Preparation for geometry.
- Appreciation of line and form.
- Development of creativity.

### Variation

- Remove all triangles at one time and make the figures in presentation 1
- Trace the figures on construction paper and cut them out. Then paste the variations on paper and make a booklet.
- Trace the figures on construction paper and cut them out. Then paste the variations on poster board for charts.
- Look for the figures formed in the environment, in material, floor patterns, etc.
- Label the various figures.

### Links

### Handouts/Attachments