The possible measure of XZ must lie within 5 < XZ < 21
The theorem of the triangle is that the sum of any two sides must be greater than the third side
Given the following side
XY = 8in
YZ = 13in
XZ + XY > YZ
XZ + YZ > XY
YZ + XY > XZ
Substitute the given parameters
XZ + XY > YZ
XZ + 8 > 13
XZ > 5
Also, XZ + YZ > XY
XZ + 13 > 5
XZ > -8
Lastly, YZ + XY > XZ
13 + 8 > XZ
XZ < 21
Hence the possible measure of XZ must lie within 5 < XZ < 21
Learn more on sides of triangle here:https://brainly.com/question/12240062