This instructable will show you how to make a 4 sided tetrahedron out of paper or cardboard. A quick little project that you can do with the kids. This should take about 10-15 minutes and if you can do this one you can move up to making the more complicated solids.
Step 1: Materials
Cardstock or thick paper
Nail Polish Remover: Just incase you accidentally glue your fingers.
Step 2: Make the Base Triangle
2. Measure and mark 8mm and 4mm from the left side on the top and bottom of the paper.
3.Connect the marks at top and bottom lightly.
4.Using the ruler measure 8mm from the left hand corner on an angle until it touches the 4mm mark.
5.Repeat the process from the other side. The marks should come to a point and make a perfect 8mm isosceles triangle
6.Double check the measurements and make sure all 3 sides are exactly 8mm.
7.Carefully cut the triangle out.
Step 3: Making the Body of the Solid
9.Using the cut out triangle as a template draw three triangles next to one another. Two will point up one will point down.
10.Draw another triangle pointing up on top of the middle triangle. This should resemble a larger version of the triangle you have already made.
Step 4: Score the Sides
12. Score the lines on the larger triangle.
13.Hold a ruler over the scored lines and gently lift the corner, this will allow a nice crisp bend in the paper.
Step 5: Fasten the Sides
15.Bend the tab in the middle and apply a small bit of superglue to the tab.
16.Apply the tab wait a few seconds and then bend and glue the corresponding side up to the tab.
17.Apply at least one tab to each side and glue.