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

Find a missing side length when given perimeter


The perimeter of the figure is 31, start text, space, m, end text.
What is the length of the missing side?
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0, point, 75
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
start text, m, end text
A four-sided figure with sides labeled as follows: 8 meters 6 meters, question mark meters, and 10 meters.