Use the relationship between supplementary angles to determine the value of y° if x°=125°.

(1 point)

A. 305°

B. 35°

C. 125°

D. 55°

1 answer

Supplementary angles are two angles that add up to \(180^\circ\). If \(x^\circ = 125^\circ\), we can find \(y^\circ\) using the relationship:

\[ x + y = 180 \]

Substituting \(x = 125\):

\[ 125 + y = 180 \]

To isolate \(y\), subtract \(125\) from both sides:

\[ y = 180 - 125 \] \[ y = 55 \]

Therefore, the value of \(y^\circ\) is \(55^\circ\).

The correct answer is:

D. 55°