1. The two quadrilaterals are mathematically similar. Find the value of x.

To find the value of x, we need more information about the quadrilaterals. Without any additional given information or measurements, we cannot determine the value of x.

To find the value of x, we need additional information such as the ratios of corresponding sides or the ratios of corresponding angles between the two quadrilaterals. Please provide more details or information about the problem.