Answer:
> 6 cm
Step-by-step explanation:
Let b represent the length of the base in cm. Then the perimeter is ...
b + (b -2) + (b +3) > 19
3b +1 > 19 . . . . . . collect terms
3b > 18 . . . . . . . . subtract 1
b > 6 . . . . . . . . . divide by 3
The length of the base is greater than 6 cm.