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Find missing length when given area of a parallelogram

Problem

The parallelogram shown below has an area of 20 units2.
A parallelogram. The segment representing the height of the parallelogram is in the middle of the figure, splitting the figure in 2 parts. The base of the parallelogram is labeled b units and the height of the parallelogram is 4 units.
Find the missing base.
b=
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
units
Stuck?
Stuck?