Answer:
13.6 cm
Step-by-step explanation:
The area (A) of a parallelogram is calculated using the formula
A = bh ← b is the base and h the height
here A = 216.24 and h = 15.9, hence
15.9b = 216.24 ( divide both sides by 15.9 )
b = [tex]\frac{216.24}{15.9}[/tex] = 13.6 cm