Practice problem $10\mathrm{.}7$

The illustration depicts a construction consisting of a pair of beams connected by a frictionless pin at point $D.$ The requirements are as follows:

Determine the reactions at the supports, specifying their directions.

Construct a shear diagram, marking the values of shear force $(V)$ at all critical points.

Create a bending moment diagram, marking the values of bending moments $(M)$ at all key points. Demonstrate the method used to derive these values.