Question 301960
Let's base lenght be "b"
Shorter side = (b - 2)cm
Longer side = (b + 3)cm

Perimeter is the sum of all lengths:

b + b - 2 + b + 3 = 3b - 1 

3b - 1 > 19 

3b > 19 + 1 
3b > 20 cm
b > (20÷3) cm
b > 6.666 cm 

Answer: The base length has to be greater than 6.67cm.