Please reason step by step, and put your final answer within \boxed{}.
On the sides of triangle \(ABC\), there are given points \(D, E, F, G\), as shown in the picture. It is given that the quadrilateral \(DEFG\) is a rhombus, and the line segments \(AD, DE,\) and \(EB\) are congruent to each other.

Determine the measure of angle \(ACB\).
user