To determine the area of a triangle, we need some information such as the base and height or the lengths of all three sides. The area of a triangle can be calculated using the formula:
\[ \text{Area} = \frac{1}{2} \times \text{base} \times \text{height} \]
Alternatively, if we know the lengths of all three sides (let's call them \(a\), \(b\), and \(c\)), we can use Heron's formula:
\[ s = \frac{a + b + c}{2} \]
\[ \text{Area} = \sqrt{s(s-a)(s-b)(s-c)} \]
Without specific dimensions or sides of the triangle, I can't directly calculate the area.
Given the responses you provided (18, 9, 15), could you please give more details about the triangle? For example, the lengths of the sides or the base and height?