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Find the value of the angle marked y

September 7, 2026Mathematics

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Answer

\mathbf{55}

Step-by-step solution

3 steps

Identify the relationship between the angles.
The angle marked $y^\circ$ and the angle $125^\circ$ are adjacent angles on a straight line. Angles on a straight line are supplementary, meaning their sum is $180^\circ$ .
Set up the equation based on the relationship.
$y^\circ + 125^\circ = 180^\circ$
Solve for $y$ .
$y^\circ = 180^\circ - 125^\circ$ $y^\circ = 55^\circ$
The value of $y$ is $\boxed{\mathbf{55}}$ .

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