

2D Shapes: Circle, SemiCircle, Square, Rectangle, Triangle, Polygon, Hexagon, Heptagon, Octagon, Nonagon, Decagon.
3D Shapes: Sphere, Cone, Cylinder, Prism, Pyramid, Cube, Cuboid.



Triangle  3, Quadrilateral  4, Pentagon  5, Hexagon  6, Heptagon  7, Octagon  8, Nonagon  9, Decagon  10.



Cylinder, Cone, Sphere, Cube, Rectangular Prism, Pyramid



Right Angle, Acute Angle, Obtuse Angle, Bisected Angle, Perpendicular Lines, Intersecting Lines, Parallel Lines.





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 threedimensional 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 realworld tessellations in nature and humanmade objects.



Tessellations  Includes 8 page lession guide.
Creaturemotif 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.



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