Compositions of rotations, glide reflections, etc

$R_{B,\frac{\pi}{2}} \circ \gamma_{DC}$
$R_{D,\frac{\pi}{2}} \circ \gamma_{DC}$
$\gamma_{CB}\circ \gamma_{DC}$
For the first one, I eventually got $\gamma_{D'K'}$ where D'= (0, .5) and K'=(-.5,0), but I don't think that's right...