In a triangle \(ABC\) on the side \(BC\) there is a point \(D\) such that \(AD = BD\) and \(AB = DC = AC\). Calculate the angles of \(ABC\)!

Trijstūrī \(ABC\) uz malas \(BC\) atlikts tāds punkts \(D\), ka \(AD = BD\) un \(AB = DC = AC\). Aprēķināt trijstūra \(ABC\) leņķus!