Answer
$ l = 7cm$
Work Step by Step
$ l = \sqrt {25^2 - 24^2} = \sqrt {625 - 576} = \sqrt {49} = 7cm$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.