Area of triangle = \( \frac{1}{2} \times \text{base} \times \text{height} \)<br><br>
&bull; Base YZ = WY + WZ = 7 + 23 = 30 cm<br>
&bull; Height WX = 9 cm (perpendicular to YZ)<br>
&bull; Area = \( \frac{1}{2} \times 30 \times 9 = 135 \) cm&sup2;<br><br>
Final Answer: 135