Respuesta :

The answer is 25.9. To find it add the other sides (21.5 + 32.4 + 28.7 = 82.6) Then take the perimeter (108.5) and subtract (108.5 - 82.6 = 25.9)
25.9 +21.5+32.4+28.7=108.5 
SO THE ONE side will be 25.9