Starting with point O, draw a line segment OP1​ of unit length.Now draw a line segment P1​P2​ perpendicular to OP1​ again of unit length. Here always we need to keep in mind that the measure of the line segment would always be a constant, i.e., 1 unit.Now again daw a line segment P2​P3​ perpendicular to OP2​ of unit length.Again draw a line segment P3​P4​ perpendicular to OP3​.In this way, we have formed a figure as shown in figure.