Activity $3$: Skill$-$building Activities

I. Identify whether the structure is unstable, statically determinate or statically indeterminate. If the structure is indeterminate, state the degree of indeterminacy.

$($a$)$

$($c$)$

$($d$)$

$($b$)$

II$.$ Determine the reactions at the supports for the structure shown.

a$.$