Answer
9 mm
Work Step by Step
Let x equal the distance from the center of the circle to the chord.
x$^2$=15$^2$-12$^2$
x$^2$=225-144
x$^2$=81
x=9
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.