What name shall I give to this problem?

Geometry Level 3

Let $\Delta ABC$ be a right angled triangle with $\angle C = 90^{o}$ . Suppose that $AP$ and $BQ$ be the angular bisectors of $\angle CAB$ and $\angle CBA$ respectively. Let $M$ and $N$ be perpendiculars respectively from $P$ and $Q$ on to $AB$ . Find the value of $\angle MCN$ (in degree).

What name shall I give to this problem?

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