Angles on a straight line add up to 180&deg;.<br><br>
&bull; XYZ is a straight line, so angles on it sum to 180&deg;<br>
&bull; Read the given angles on line XYZ from the diagram<br>
&bull; Angle k = 180&deg; − given angle<br>
&bull; Angle k = 180&deg; − 102&deg; = 78&deg;<br><br>
Final Answer: 78