Classroom Posters
Each of our classroom posters measures 22" x 34" and comes with an 8-page lesson guide (except Circles of Descartes, which is 4 pages) that include worksheets that may be copied.
The Circles of Descartes
This 22" x 34" poster describes the Descartes Circle Theorem and shows some of the beautiful and complex figures, known as Apollonian packings, that can be created using the theorem. In the early part of the 17th century, RenŽ Descartes described a simple relationship between the curvatures of four mutually tangent circles. Given the curvatures of three of the circles, it is possible to calculate the curvature of the fourth by a straightforward solution to a quadratic equation. (It may be the coolest thing you'll ever see done with a quadratic equation!) This allows the construction of fascinating figures know as Apollonian packings, in which an infinite number of circles fit inside a large outer circle. In fact, there are many Apollonian packings for which every circle has integer curvature. Some arrangements lead to intriguing number sequences, such as the squares (1, 4, 9, 16, 25 ...). Grades 7-12. You may click on the image of the poster at left to see a larger jpeg.
Item no. 4106. Suggested retail price: $13.95.
Fractals in Our World
This poster uses photographs of real-world scenes and objects to demonstrate the role that fractals play in nature and human-made objects. The objective of the poster is to help students link the math they learn in the classroom to what they see in the world around them. You may click on the image of the poster at left to see a larger jpeg.
Item no. 4105. Suggested retail price: $13.95.
Polyhedra in Our World
This poster uses photographs of real-world scenes and objects to demonstrate the role that polyhedra play in nature and human-made objects. The objective of the poster is to help students link the math they learn in the classroom to what they see in the world around them. You may click on the image of the poster at left to see a larger jpeg.
Item no. 075. Suggested retail price: $13.95.
Tessellations in Our World
This poster uses photographs of real-world scenes and objects to demonstrate the role that tessellations play in nature and human-made objects. The objective of the poster is to help students link the math they learn in the classroom to what they see in the world around them. You may click on the image of the poster at left to see a larger jpeg.
Item no. 074. Suggested retail price: $13.95.
Regular Polygon Tessellations
This poster shows 18 tessellations of regular polygons, including the 3 regular and 8 semiregular tessellations. You may click on the image of the poster at left to see a larger jpeg.
Item no. 054. Suggested retail price: $13.95.
Symmetry in Tessellations
This poster uses Dr. Fathauer's creature-motif tessellations to demonstrate the different types of symmetry that tessellations can possess. You may click on the image of the poster at left to see a larger jpeg.
Item no. 055. Suggested retail price: $13.95.
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