EXPLANATION
Let's see the facts:
Height = 34 in
Area = 374 in^2
The length of the base can we obtained applying the following relationship:
[tex]\text{Area}=\frac{\text{Base}\cdot\text{Height}}{2}[/tex]Replacing terms:
[tex]374=\frac{\text{Base}\cdot34}{2}[/tex]Multiplying both sides by 2/34:
[tex]374\cdot\frac{2}{34}=\text{Base}[/tex]Multiplying fractions:
[tex]22=\text{Base}[/tex]Switching sides:
Base = 22 units
The answer is 22 inches