To find the area of the parallelogram, multiply the base with the height.
a = area
b = base
h = height
a = bh is your equation
Plug in 18.3 for b, and 17.9 for h
a = (18.3)(17.9)
Simplify
a = 327.57
The area of the parallelogram is 327.57 in²
hope this helps