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Find missing length when given area of a triangle


The triangle shown below has an area of 4 units2.
A triangle. There is a dashed line that is perpendicular to the base from the base to the opposite vertex. The dashed line creates two right triangles. An arrow shows the length of the base is labeled x. The dashed line is labeled 4.
Find the missing length.
  • 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