To find the length of the unknown leg of the triangle, we will need to use the Pythagorean Theorem.
Pythagorean Theorem: a^2 + b^2 = c^2
---a and b are the legs of the triangle
---c is the hypotenuse
a = 2
b = ?
c = 3
2^2 + b^2 = 3^2
4 + b^2 = 9
b^2 = 5
b = 2.236
b (rounded) = 2.2
Answer: 2.2 ft
Hope this helps!