## Circles and Polygons

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Here we will list all work with a short descriptions and links to subpages that contain 2-3 different contributions (otherwhise pages get too long). Sometimes we also announce future projects to share work or let students cooperate or have ideas for continuation by another country.

Red color: GER       green color:  RO      yellow color: CRO      blue color: POL      violet color: It      brown color:  LV

Project 1:

• Artwork of 10 years old students having to do with Fibonnacci circles and colours of Piet Mondrian (GER)
• ​RO students(7 grade) can make in ggb design and calculate the areas..., percentages between colors...or can create problems on the designs.
• CRO students (7 grade) can calculate the areas and the ratio between areas.
• POL students (6 grade) program the Ozobot - "Ozobot Bit -The Fibonacci Traveler"
• LV students (5 grade) Polygon art using Golden Ratio inspired by Piet Mondrian
• Ying Yang, Geogebra and wonderful pattern  (GER)
• Wonderful patter in Geogebra - 6 grade (CRO)
• The string of odd natural numbers in triangles and squares (RO)
• Multiplication table and numbers in the circle (CRO)
• Students (grade 5 mainly) can continue and report about their discoveries  (GER)
• Art and math discoveries with circles and polygons constructed with GeoGebra (GER)
• Learning math area and perimeters on polygones and circles made by german students (RO)

Project 5:

• same Polygons and different circles and a surprise (GER)
• RO students create a tool for German students
• Students will constructively demonstrate this rule on paper (CRO)
• Construct the circumcircle  of  a  triangle and construct the incircle of a triangle (IT), proof of the Japanese theorem for cyclic polygons
• regular Polygons and more ...(POL)

Project 7: star project

• RO students  construct tool collection for different stars
• GER students fold and cut out, make stitch art and construct with GeoGebra
• CRO students create christmas cards with stars
• GER students learned from RO students how to create star tools and create christmas cards

Project 8: Rectangles, squares....

• Polygon art using golden ratio inspired by Piet Mondrian (LV)
• German students will work on it in the topic "curves and spirals"
• Triangle art (GER)
• Polygon in art in various artistic epochs - cubism   (CRO)

Project 10: Cryptography and Art

• Cryptography task and message proposed by RO, solutions by IT using Analitic Geometry
• Cryptography task and message proposed by IT, solutions by RO using Analitic Geometry