Log in to add a comment

Log in to add a comment

Place each of the other 3 matchstick vertically at each of the 3 edges of the triangle

Make each of the 3 exposed ends of the 3 vertically up-right matchsticks to meet each other.

The result is actually a 3D triangle with the four sides consisting of the 3 sides of the 3D Triangle and the last side resting on the table.