Super Shapes
There are lots of different shapes in geometry. The shapes below are all polygons:

Terrific Triangles
Three-sided polygons are called triangles. Triangles always have three sides, but the sides are not always the same length. Here are some different kinds of triangles:

Awesome Angles
Every polygon has angles. An angle is the place where two lines meet or intersect. Different kinds of angles include

Perfect Polyhedrons
What do you get when you connect a bunch of polygons? A polyhedron! This is a geometric solid (or three-dimensional figure) whose sides or faces are polygons. The faces are connected by edges. The following shapes are all polyhedra (that's the word for more than one polyhedron):

Because polyhedrons have sides that are polygons, you can make a flat drawing of the polygons that will turn into a solid when you fold it. This is called a net or "shape jacket." A net for a tetrahedron looks like this:

To see how this net folds up, visit Interactives: Geometry 3D Shapes and check out the tool at the bottom of the page.

Need Help Using the Crossword Puzzles Tool?

• To enter a word, click on a box anywhere in the word.
• You can check your answers using the Check Puzzle button. Letters that are correct will be green; letters that are incorrect will be red.
• Make the puzzle bigger and smaller by clicking on the + and - buttons on the screen.
• You can grab the puzzle and move it around on the screen. The Center button moves the puzzle back to the middle.
• You can turn the sound off and on using the sound icon.
• You cannot save your work in the puzzle. Make sure you click the Print button and print your puzzle before you exit.