The Circle Poster
$9.95
A clear, easy to understand poster that graphically and verbally explains the wonders of the circle. Circumference, diameter, radius chords, semicircles, arcs, quadrants, segments, tangents  all are explained simply and clearly. Further explanatory sections introduces angles and the circle, calculating area and the concept of Pi. 23" x 33".

Curve Stitching Poster
$9.95
Curve stitching is the art of creating the envelopes of curves by following simple mathematical rules. Each stitch which is sewn contributes a small portion of the envelope. As the sewing progresses, the shape of the curve is revealed. 23" x 33".

Mystic Roses Poster
$9.95
Shows different "mystic roses" – regular polygons with all of their diagonals drawn within a circle. These beautiful images become more and more complex as the number of sides of the starting polygon increases. 23" x 33".

Celtic Knots Poster
$9.95
This poster shows the way that a variety of different types of Celtic Knots are constructed from grids. The horn design, a square design and designs based on the Book of Kells and the Lindisfarne Gospels are shown. 23" x 33".

The Golden Ratio Poster
$9.95
Describes the many properties of one of the most fascinating numbers. 23" x 33".

Nets and Solids Poster
$9.95
The net of a threedimensional solid is a flat diagram that can be cut out and rolled and/or folded to form the solid. This poster shows the nets for a variety of common solids. 23" x 33".

Regular Polygon Tessellations poster
$11.95
Colorful poster showing a variety of tessellations of regular polygons. Comes with an 8page lesson guide, including five copyable worksheets. 22" x 34".

Polyhedra in Our World Poster
$11.95
Poster with ten photographs illustrating the occurance of polyhedra in natural and manmake objects. Comes with an 8page lesson guide, including five copyable worksheets. 22" x 34".

Fractals in Our World poster
$11.95
Poster with a number of photographs illustrating the role of fractals in natural and manmade objects. Comes with an 8page lesson guide, including four reproducible worksheets. 22" x 34".

The Circles of Descartes poster
$11.95
This 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 712. 22" x 34".

Polyhedra Poster
$9.95
This poster shows all convex polyhedra with regular polygonal faces, including a finite sampling of prisms and antiprisms. 22" x 37".
