Its internal angles total 1,260 degrees

• Nine-sided figure
• Defective stop sign?
• Shape of all Baha'i Faith temples
• Nine sided object
• A nine-sided polygon
• Shape whose interior angles total 1,260 degrees
• News about Bosnia regularly ignored – go figure
• Canon agonises somewhat to reveal figure
• Nine-sider

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"plane figure with nine sides," 1680s, a hybrid from Latin nonus "ninth" (see nones ) + ending from pentagon , etc.