What is the supplement of a acute angle?

First, an acute angle is an Angle that is less than a right angle (<90°)

Secondly, an obtuse angle is one that is more than a right angle but less then a straight angle (<180°)

then, the complementary angles of a pair of angles is 90° or a Right angle

and the complement of an acute angle is the amount needed of an unknown angle (against known angles) to make 90° or a right angle

a supplementary angle are a pair of angles which, when Added together, make 180° or a straight line.

and the suplement to an angle is the value of an unknow angle to to be added on to make 180°