I need help my self lol XD
Check the picture below
it can't be -3... since is width unit, so it has to be the other
and recall that length = 2w - 5
Awnser is in the photo below
Answer:

Step-by-step explanation:
x is the center of the circle.
the chord of length 12 can be splitted into two parts of 6 length each.
since the radius does not change when it touches another end of the circle, we can safely calculate our radius to be the hypotenuse of the triangle formed by the length of the chord and 3.
The explanation is given in the picture