Answer
$G$
Work Step by Step
We know that the three interior angles of a triangle equal $180^{\circ}$. If we are already given two of the angles, we can figure out the third angle.
Let us set up the equation to add the three angles together. One angle measures $68^{\circ}$, and the other measures $54^{\circ}$. Let $x$ be the measure of the last angle:
$68 + 54 + x = 180$
Let's add the constants together on the left side of the equation to simplify:
$122 + x = 180$
To solve for $x$, subtract $122$ from each side of the equation:
$122 - 122 + x = 180 - 122$
Subtract to simplify:
$x = 58$
The third angle measures $58^{\circ}$. This corresponds to option $G$.
