Answer:
The height of the parallelogram is 19 sq. un.
Step-by-step explanation:
If the area is 399 and the base is 21, then the answer is 19.
The Intuition for why the area of a parallelogram is A=bh (area = base x height)
The formula for the area of a parallelogram is base times height, just like the formula for the area of a rectangle.
Have a great day!
