In a square $ABCD$, the diagonals $AC$ and $BD$ are drawn. Then $\angle BAC$ $=$  $°$

In the quadrilateral $\mathrm{PQRS}$

 Name the sides, vertices and diagonal

In the quadrilateral $\mathrm{PQRS}$

Also name all the pairs of adjacent sides, adjacent angles, opposite sides and opposite angles.

The three angles of a quadrilateral are ${60}^{°}, {80}^{°}$and ${120}^{°}$. The forth angle is $k^{°}$. Find the value of $k$.