Making a triangular pyramid is simple with the right tools. A triangular pyramid has three faces and a triangular base. All the triangles are the same size and shape. This project can be done with paper, tools and glue, however, you can apply the technique to make a triangular pyramid with other building materials as well. Triangular pyramids differ from square pyramids in that square pyramids have a square base and four triangular sides.

Draw a 3-inch line with your ruler about 1/3 of the way from the bottom of the piece of paper.

Measure a 45 degree angle with your protractor at each of the ends of the line you drew. Use the ruler to draw the lines from the ends of the first line up to the top, making a large triangle. This triangle should be 3 inches on each edge.

Mark the midpoint of each line with your pencil, using your ruler to find the midpoint. The midpoint is 1.5 inches.

Draw lines to connect the midpoints you marked. Now you have a large triangle drawn with a smaller, upside-down triangle in the middle. You can also look at it as four triangles.

Draw small flaps outside each of the triangle points on each side, so that you have three flaps. These will be used to glue the pyramid together.

Cut out your shape that you have made, including the flaps.

Fold along the lines of the triangles. The three sides should bend up into a pyramid shape. Put glue on the outside of the flaps. Fold the pyramid together and hold the glued flaps on the inside of the pyramid.

### Things you need

- Paper
- Pencil
- Protractor
- Ruler
- Scissors
- Glue

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