The rectangle is divided into 2 parts by a dotted line.<br><br>
&bull; Find the total area of the rectangle from the figure<br>
&bull; The shaded part is a triangle with area \( \frac{1}{2} \times \text{base} \times \text{height} \)<br>
&bull; Area of shaded part = 45 cm&sup2;<br><br>
Final Answer: 45