<u>Given</u>:
The measure of arc XY is (31x)°
The measure of arc YZ is (35x - 16)°
We need to determine the value of x, measure of arc XYZ and arc XZ.
<u>Value of x:</u>
From the figure, it is obvious that the arcs XY and YZ are congruent.
Thus, we have;
![31x=35x-16](https://tex.z-dn.net/?f=31x%3D35x-16)
Subtracting both sides by 35x, we have;
![-4x=-16](https://tex.z-dn.net/?f=-4x%3D-16)
![x=4](https://tex.z-dn.net/?f=x%3D4)
Thus, the value of x is 4.
<u>Measure of arc XYZ:</u>
The measure of arc XYZ is given by
![m \widehat{XYZ}=m \widehat{XY}+m \widehat{YZ}](https://tex.z-dn.net/?f=m%20%5Cwidehat%7BXYZ%7D%3Dm%20%5Cwidehat%7BXY%7D%2Bm%20%5Cwidehat%7BYZ%7D)
The measure of arc XY is given by
![m \widehat{X Y}=31(4)=124^{\circ}](https://tex.z-dn.net/?f=m%20%5Cwidehat%7BX%20Y%7D%3D31%284%29%3D124%5E%7B%5Ccirc%7D)
The measure of arc YZ is given by
![m \widehat{Y Z}=35(4)-16=124^{\circ}](https://tex.z-dn.net/?f=m%20%5Cwidehat%7BY%20Z%7D%3D35%284%29-16%3D124%5E%7B%5Ccirc%7D)
Hence, the measure of arc XYZ is given by
![m \widehat{XYZ}=124^{\circ}+124^{\circ}=248^{\circ}](https://tex.z-dn.net/?f=m%20%5Cwidehat%7BXYZ%7D%3D124%5E%7B%5Ccirc%7D%2B124%5E%7B%5Ccirc%7D%3D248%5E%7B%5Ccirc%7D)
Therefore, the measure of arc XYZ is 248°
<u>Measure of arc XZ:</u>
The measure of arc XZ is given by
![m \widehat{XZ}=360^{\circ}-m \widehat{XYZ}](https://tex.z-dn.net/?f=m%20%5Cwidehat%7BXZ%7D%3D360%5E%7B%5Ccirc%7D-m%20%5Cwidehat%7BXYZ%7D)
Substituting the values, we have;
![m \widehat{XZ}=360^{\circ}-248^{\circ}](https://tex.z-dn.net/?f=m%20%5Cwidehat%7BXZ%7D%3D360%5E%7B%5Ccirc%7D-248%5E%7B%5Ccirc%7D)
![m \widehat{XZ}=112^{\circ}](https://tex.z-dn.net/?f=m%20%5Cwidehat%7BXZ%7D%3D112%5E%7B%5Ccirc%7D)
Thus, the measure of arc XZ is 112°