Respuesta :

if they form a pair of 90 degree angles

Answer:

The make complementary 90º angles.

Step-by-step explanation:

When two line segments are perpendicular one of them divides the other one into two complementary 90º degrees angles, in that way we have to remember that a straight line is an angle of 180º degrees, when another angle divides the line into two 90º degrees they are perpendicular.