$11.$The statically determinacy of a structure is determined by the equation, $r=3n$

The statically indeterminacy of a structure is also determined by the equation, $r>3n,$ The degree of indeterminacy is given by $i_e=r-3n$

where, $r=$ the number of reactions and moment components

$n=$ total number of parts of the structure member

$3=$ the three equilibrium Equations

$($a$)$ Draw a Free body diagram for the beam below.

$($b$)$ Determine if the beamis statically determinate or indeterminate.

$($c$)$ Find the degree of indeterminacy.

A

$10$ ft

B

Fig. $11$

Figure not drawn to scale.