For this case we have that by definition, the area of a triangle is given by:
![A = \frac {1} {2} b * h](https://img.qammunity.org/2020/formulas/mathematics/high-school/a6kzv7mf47580r4i4wlhfgwdjdjpt2ksoy.png)
Where:
b: It's the base
h: It's the height
Substituting the values, according to the given data:
![225 = \frac {1} {2} (15) * h\\225 = 7.5h](https://img.qammunity.org/2020/formulas/mathematics/middle-school/g9i44a8p61od2me82n14jhbttmwj1eh8cp.png)
Dividing between 7.5 on both sides of the equation:
![h = \frac {225} {7.5}\\h = 30](https://img.qammunity.org/2020/formulas/mathematics/middle-school/tp1zz61ba52h089ibubpxicfvladanxb5t.png)
Thus, the height of the triangle is 30ft
Answer:
30ft