Answer:
<h2>Each exterior angle measures 45°.</h2>
Step-by-step explanation:
First of all, we have to know that a stained glass window has 8 sides. So, it's a regular polygon with 8 sides.
Now, the sum of all interior angles of any regular polygon is expressed as
However, the problem is asking only about exterior angles.
We know by definition that a polygon exterior angles sum 360°, and in this case, the polygon has 8 equal exterior angels. So, each of them would measure
Therefore, each exterior angle measures 45°.