Related Clues:

• Arm bones
• Math measurements
• Skeletal parts
• Minute hands, essentially
• Wheel spokes, e.g.
• Circle parts
• They form central angles
• Spoke more than once?
• Semidiameters
• Spokes
• They're up in arms
• Lines on sonar screens
• Olecranons are part of them
• Skeleton parts
• They're parallel to radii