If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Area of triangles


Look at the image below.
A scalene 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 8. The dashed line is labeled 4. The longest side of the bottom right triangle is labeled 5.
What is the area of the triangle?
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0.75
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4