Question

The line $d$ is parallel to $e$, as shown in the figure above. Find the value of $y$ in deg.

Answer 1

In the figure, $y$ is the exterior angle of the triangle shown, having two of its angles as ${90}^o$ and ${58}^o$

We know, by exterior angle property, an exterior angle of a triangle is the sum of the other two interior angles.

$\therefore y={90}^o+{58}^o={148}^o$

Hence, the value of $y$ in degree is $148$.