This net is composed of four equilateral triangles laid out in such a way that the four together appear to form a much larger triangle. Picture a large triangle that has equal sides. Within is a smaller triangle placed upside-down. All three points of this smaller triangle touch the three sides of the larger triangle. The remaining spaces around the upside-down triangle also become triangles so that the larger triangle now has four smaller triangles of the same size and shape within.
Another net used to create a triangular pyramid consists of four equilateral triangles laid side by side. The first is point up, the next point down, the third point up and the last point down.
An isosceles triangle has two sides of the same length with the third side being a different length. To draw a triangular pyramid net around this base, three other triangles are drawn with their points centered an equal distance from each side of the base triangle.
All sides of a scalene triangle are different lengths. A triangular pyramid net can be created by drawing three triangles around this triangular base. Again, the points of these triangles should be centered an equal distance from each side.