Bay window may be half square, semi-hexagonal, semi-octagonal or semi-circular in plan. The bay window has angles of 90, 135, or 150 degrees, though triangular bays formed of two windows set at 120 degrees are also found.
Bay windows are most popular for allowing maximum light to enter a room, as the sun moves across the sky over the course of a day.
The bay window depends on a curved architecture and uses more glass panels than a bay window does (to account for the curvature).
