Possible Clues:

• 1080-degree figure
• Figure duck disturbed cat and left shortly
• Stop sign, for one
• Figure with 8 sides
• Shape with 135-degree angles
• Dome of the Rock shape
• Figure of eight with a label on the end of it (7)
• A regular one's angles are each 135 degrees
• Plane eight-sided figure
• Sounds like 17 across on all sides