Distance from key to bridge?

[Djur]

Distance from center front of the key to the Coopertition bridge:

324 inches from alliance wall to center of court
-44 inches from center of court to end of bridge
-144 inches from alliance wall to front of key
=
136 inches (11 feet 4 inches)

Source: FIRST manual

EDIT: I'm not sure if you were talking about the end of the key closest to the bridge or to the alliance wall, so here're the calculations for the tip of the semicircle:

324 inches from alliance wall to center
-44 inches from center to edge of bridge
-(144 inches from wall to closest edge of key + 48 inch depth of key)
=
88 inches

Hope I've helped!