The fortifications covered the city on a 180 degree arc in two rings.

Embedded on the concrete pavement was a steel traversing mechanism once used to swing the gun in a 180 degree arc.

Appearing when fire is held down, this long beam weapon can be swung in a 360 degree arc.

These are electronically controlled and cover a 90 degree arc without moving the antenna.

Detritus's arm whirled round in a 180 degree arc with oblivion on the end of it.

The trap machine oscillates left to right within a 45 degree arc.

The entire valley below seemed to be swinging through a forty-five degree arc.

The engagement envelope is a 3 km, 45 degree arc centered on the missiles launch axis.

The arch rings are 120 degree arcs of circles.

The camera was capable of capturing an image in a 120 degree arc.