To find the value of \( x \) in a triangle where one of the angles is \( 43^\circ \) and the other angle is denoted as \( x \) (while the third angle is a right angle, \( 90^\circ \)), we can use the fact that the sum of the angles in a triangle is always \( 180^\circ \).
The equation can be set up as follows:
\[ x + 43^\circ + 90^\circ = 180^\circ \]
Now combine \( 43^\circ \) and \( 90^\circ \):
\[ x + 133^\circ = 180^\circ \]
Next, solve for \( x \):
\[ x = 180^\circ - 133^\circ \] \[ x = 47^\circ \]
Thus, the value of \( x \) is:
\[ \boxed{47^\circ} \]