Answer:
125°
Step-by-step explanation:
Supplementary angles add up to 180°, so the supplement of 55° and 55° should add up to 180°.
Lets say x is the supplement of 55°.
180° = 55° + x°
-55° both sides
125° = x°
x° = 125°
The supplement of 55° is 125°.
