Keywords - Plane forms, perimeters and areas. Didactic materials - Masking tape.

Description - The trainer traces large geometric shapes on the ground with the sides being at least 2-metres long. The number of shapes has to be high enough that the total number of sides is greater or equal to half of the participants.

E.g. - 20 participants need at least 10 sides: 1 square and 2 triangles.

The trainer can use music to make the activity more lively. Half the group observes and is the audience. The other half of the participants involved, with the go-ahead of the trainer, begin to move within the space walking along the sides/lengths of the shapes traced on the floor. At the trainer’s signal, the participants will transform their walk according to their position.

E.g: «Those on a base turn into an elderly person»

«Those on a height turn into a chicken»

«Those on a hypotenuse turn into an airplane»

The trainer calls out a stop during which the participants remain immobile and at which point the trainer, with the help of the audience, determines whether the walk exhibited is appropriate for the side on which the participant is standing.

Once there is a basic understanding of the process, it is possible to ask the participants to show the sequences of walks along the shape as they follow the parts needed to calculate the perimeter or the area.

The nature of the types of walks can be emphasised by a context (era, cinematographic style, etc.) and by music chosen by the participants.

In the second phase, it is important to leave the participants enough time to prepare their performance which will subsequently be shown to the public.

Duration - A minimum of 45 minutes.