# Constructive Triangles - Rec. Box A

#### $299.00

##### Description

A rectangular box - 2 yellow equilateral triangles, 2 yellow right-angled isosceles triangles with a black line on one of the sides enclosing the right angle, 2 green right-angled isosceles triangles with black lines along the hypotenuse, 2 yellow right-angled scalene triangles with a black line on the shortest side enclosing the right angle, 2 green right-angled scalene triangles with a black line on the longer side enclosing the right angle, 2 gray right-angled scalene triangles with black lines along one of the sides, 2 red triangles: 1 right-angled scalene triangle with black lines along the longer side enclosing the right angle and 1 obtuse-angled scalene triangle with black lines along the side opposite the obtuse angle

Until we can offer this product directly from The Montessori Company we are recommending the vendor above. If you don't have an AMAZING experience with their product or if our pricing information is no longer accurate please let us know so we can update our recommendation appropriately.

##### Purpose

- To Show that by Joining Together Different Triangles, 4 Sided Figures are Obtained

##### Video

##### Presentation

- Have the child lay out a mat on the floor. Show the child how to carry the box, and have him carry it to the mat.
- Take out the first set of shapes. The first set of shapes are the two equilateral yellow triangles (they form the rhombus), the two green right-angled isosceles triangles (they form the square), and the two grey right angled scalene triangles (they form the rectangle).
- Take these shapes out and place them randomly on the mat.
- Find two identical figures/or pairs. After finding the pair, place the pair of shapes close together. Run your finger along the edge of the shape on the black line. Do this on both shapes. Once you have lined up the shapes, place both hands on both shapes, and push the shapes together lining them up at the black line.
- Do this for all three figures. First create the rhombus, then the square and finally create the gray rectangle.
- After you have formed these first three figures, open the box top once more.
- Take out the next set of figures. These figures include the last two sets of yellow figures, which are two right-angled isosceles triangles, and two right-angled scalene triangles. Both of these sets form two different parallelograms. Also retrieve the two green right-angled scalene triangles – these form the a parallelogram as well. The only two figures that should be left in the box are the two pieces that form the trapezoid (the two red scalene triangles).
- Place the six figures that you just took out of the box scattered on the mat.
- Retrieve two like pieces and place them close to one another. Form their shape just like you did with the first set of figures (pointing to their black lines, and pushing them together with hands on both pieces).
- Then do the next two parallelograms with the figure you just took out of the box. The order of these does not matter, as they are all parallelograms.
- The parallelograms should be placed in a row just below the first set of figures.
- Open the box and take out the last two pieces (the two red scalene triangles).
- Form the trapezoid in the same manner as outlined above, and form the trapezoid below the row of parallelograms.
- Look at all the figures with the child. Ask the child is he recognizes any figures on the mat.
- Disorder the figures on the mat, and invite the child to do the presentation.
- To put away the material away, scatter the shapes on the mat, then pair the shapes up and place them directly on top of one another. Place their black lines on top of one another.
- Place the yellow, green, and grey triangles that are exactly the same shape together, and in a corner of the box.
- Place the yellow, and green large triangles that are exactly the same size on top of one another, and in a corner of the box.
- Place the red, and yellow small triangles are loose in the box in the center.