Draw a line
Draw a horizontal line on the sheet of paper on the top using a ruler.
Draw the second line at an acute angle on the left, slightly further from the beginning of the first line.
Draw a triangle as it’s shown in the picture. In addition, there should be another line on the left side but it does not touch the side of the triangle.
Now draw a smaller triangle in the larger triangle.
On the left side of the triangle, draw a third line.
Draw another triangle. This time, the lines of the triangle must be intersected in the center. You must get a square.
Facets of the cube
On the left side of the square draw a vertical line connecting with the lower part.
Draw the same line on the other side.
In the center, add the edge of the cube by drawing a vertical line in the center.
Remove unnecessary lines
Erase unnecessary lines at this stage, leaving only the cube.
The cube is ready. You can color it with one color, purple, for example, or make it colorful.