Given:
Triangle ABC is similar to triangle XYZ.
The measures of the sides are AB = 6 cm, BC = 18 cm and XY = 12 cm
We need to determine the measure of side YZ.
Measure of YZ:
Since, ABC and XYZ are similar triangles, by using similar triangles property, we have;

Let the length of YZ be x.
Substituting the values, we get;

Cross multiplying, we get;


Dividing both sides by 6, we have;

Thus, the value of x is 36.
Hence, the measure of the side YZ is 36 cm.