The area \( A \) of the triangle can be calculated using the formula:
\[ A = \frac{1}{2}bh \]
where \( b \) is the width (base) and \( h \) is the height.
Given:
- Height \( h = 3 \) m
- Width (base) \( b = 8 \) m
Substituting the values into the formula:
\[ A = \frac{1}{2} \times 8 \times 3 \] \[ A = \frac{1}{2} \times 24 \] \[ A = 12 \]
Thus, the area of the triangle is \( 12 \).
Final answer: 12