The Triangle ABC represents a landscaped area inside a square land parcel. AC is parallel to a side of the square. Find AB

Answer:
6√5
Step-by-step explanation:
ABC is right triangle
if the length of hypotenuse is 18 ft and base is 12 ft. then the side length would be
18^2 - 12^2 = AB^2
324 - 144 =√180
AB = 6√5