Answer:
25 ft²
Explanation:
The hypotenuse = 
 = 13 ft
 = 13 ft
the side with area 144 ft² = 
 = 12 ft
 = 12 ft
Using Pythagoras' identity to find the third side x ( smallest )
x² + 12² = 13²
x² + 144 = 169 ( subtract 144 from both sides )
x² = 25 ( take the square root of both sides )
x = 
 = 5
 = 5
Thus area of smallest side = 5² = 25 ft²