Question

each figure.
8.
there is a triangle with interior angles 39° and 94°, and an exterior angle marked as $x^\circ$.

Explanation:

Step1: Find the third interior angle

Let the third interior angle be $y$. The sum of interior angles of a triangle is $180^\circ$.
$y = 180^\circ - 39^\circ - 94^\circ = 47^\circ$

Step2: Relate to exterior angle $x$

$x$ and $y$ are supplementary (form a linear pair).
$x = 180^\circ - 47^\circ$
Or use exterior angle theorem: $x = 39^\circ + 94^\circ$

Answer:

$133^\circ$