Related Clues:

• Some lines in circles
• Arm stiffeners
• State-named avenues in Washington, essentially
• They have a central meeting place
• Pie cuts, e.g.
• Lines from the center
• Pie chart dividers
• Pie cuts, essentially
• Spokes, essentially
• Projections from a central point
• They meet in the middle
• Pizza slice borders, e.g.
• Minute hands, say
• Half-diameters
• Neighbors of ulnae