When we study co-ordinate geometry or you can say 3-D in general. There are 3 axis ,X,Y,Z and its opposite there are again three negative axis,-X,-Y,-Z.
3-D define shape in space. 2-D define the shapes on plane, 1-D define the shapes in form of lines.
It’s all about multi -dimensions. Yantra are multi -dimension figures. It has lots of power. If you build a house, it has lots of measurement , lengths, plans, 3-D design, you do lots of calculation to make it perfect, window size door size etc. different kind of shapes are consider, it can be more fruitful if you include proper angles and direction in it . that’s what we suggest before making a house.