Geometry Educational Posters & Charts

A symmetrical figure can be divided in half, and both sides will be that same size and shape. Some figures have more than one line of symmetry.

Activities on back; support National Council of Teachers of Mathematics (NCTM) standards.

Point - Shows location; Line - Goes on forever in one direction; Line Segment - Connects two points; Ray - Goes on forever in one direction; Parallel Lines - Run in the same direction and are the same distance apart at every point; Intersecting Lines - Cross each other at only one point.

Activities on back; support National Council of Teachers of Mathematics (NCTM) standards.

Triangles - A triangle is a figure with three sides and three angles. The angles of a triangle always add up to 180 degrees (º).

Isosceles - 2 equal sides; Equilateral - 3 equal sides; Scalene - no equal sides; Right - 1 angle is 90 degrees; Obtuse - 1 angle is greater than 90 degrees; Acute - 3 angles are less than 90 degrees.

Activities on back; support National Council of Teachers of Mathematics (NCTM) standards.

Polyhedra in Our World - A polyhedron is a three-dimensional solid bounded by plane faces, each of which is a polygon.

A regular polyhedron, or Platonic solid, is one in which each ace is a regular polygon of the same type and in which the same number of faces meet at each vertex.

A prism has two parallel faces that are congruent polygons, and sides that are parallelogram.

Tessellations in Our World - A tessellation is a collection of shapes called tiles that fit together without gaps or overlays to cover a surface.

A tesselation is periodic if it can be moved by some distance in some direction and remain unchanged.

Many tessellations are based on one or two prototiles - tiles to which all of the tiles in the tesselation are similar.

Fractals in Our World - A fractal is a geometric pattern that exhibits self similiarity.

Repeatedly zooming in on a fractal reveals similar structureon different scales.

Fractal dimension is a measure of complexity ...

Tessellations, set of 4 - Introduction, Reflection, Rotation, Translation

Tessellations - Includes 8 page lession guide.

Photographic composite poster llustrating real-world tessellations in nature and human-made objects.

Tessellations - Includes 8 page lession guide.

Creature-motif tessellations.

The Circles of Descartes - In the early part of the 17th century Rene Descartes described a simple relationship between the curvatures of four mutually tagent circles. Given the curvatures of three of the circles, it is possible to calculate the curvature of the fourth by a solution of a quadratic equations, creating fascinating figures known as Apollonian packings.