Add To Favorites
Who can grasp solid geometry? Make 3-dimensional shapes to manipulate into polyhedra using Color Explosion™ paper.
When most people study the geometry of three-dimensional space, it is helpful to be able to see, feel, and build the structures. A polyhedron is a 3-D solid that made up of polygons (2-D figures made up of line segments, edges that are connected two at a time at their endpoints) or more simply, flat faces usually joined at their edges.
For this exercise, students try using a triangle (although other shapes such as squares will work). First, make a template to trace several triangles. Using a ruler, draw an equilateral triangle (3 equal sides, 3 equal angles) on cardboard with Crayola Erasable Colored Pencils. This will be the flat surface building block for the polyhedra.
On each side of the triangle, extend the edge equally to make three tabs around the triangle as shown in the picture. (When constructing shapes, these tabs will align with tabs of other triangles.) Cut out template with Crayola Scissors.
Trace the template on white Crayola Color Explosion™ Paper. To get as many triangles per sheet as possible, draw triangles next to each other so they share edges. Start out with at least 12 triangles. Cut out the triangles with scissors. Using Color Explosion™ Markers, decorate each triangle with a unique design.
Place a ruler along each tab of the cutout triangles. Bend up tab edges.
Line up the tabs of two triangles and join them together with a rubber band. Students keep adding triangles until they have constructed simple polyhedrons. Students count the number of faces, vertices, and edges to determine what shape was constructed.
After making regular polyhedra (shapes with equal edge lengths), challenge students to create irregular ones, where the sides and angles are not equal.
Engage your students in deep understanding of ratio & proportion without them even knowing! Use the children’s book “Chu
Add To Favorites
Design an optical illusion! Discover a scientific principle called the Moiré Effect. Trick your eyes and brain with line
Experiment with flight! Make bright helicopters and toss them into the air. Can you make them fall faster? Slower? Spin
Study the complex, geometric ornamentation of Islamic art. Discover intricate, authentic Zillij designs using math and a
These triangles twist and turn! How many different triangles can you suspend on a mobile?
Explore the wonders of ancient Egypt then construct a 3-D pyramid on which to display your findings.
Creating a quilt block is a great way to combine math, history, literature and art into one fun project.
Hidden images magically appear from within a grid of geometric shapes when students use contrasting colors to define the
Our crayons have been rolling off the assembly line since 1903, and you can see how it’s done.
Visit us »