A triangular skylight frame \(LMN\) is designed such that side lengths \(LM = LN\). In this variant, the exterior angle formed by extending segment \(MN\) beyond vertex \(N\) is \(136^\circ\).
Answer the following questions based on the information given:
(a) Identify the equal interior angles.
(b) Calculate interior angles ∠LNM and ∠LMN.
(c) Determine ∠L.
(d) Furthermore, a second exterior angle is created at L by extending segment ML beyond vertex L. Find the exterior angle at L.