Area of triangle = \( \frac{1}{2} \) × base × height.<br><br>
&bull; Area = \( \frac{1}{2} \) × 18.25 × 50<br>
&bull; 18.25 × 50 = 912.5<br>
&bull; Area = 912.5 ÷ 2 = 456.25 cm&sup2;<br>
<br>
Final Answer: B: 456.25 cm&sup2;