Answer:

radii

Answer	Crossword Clue
RADII	Straight sides of sectors
RADII	Half-diameters
RADII	Ulnae neighbors

RADII	Pie chart features
RADII	Pie chart lines
RADII	Circle lines
RADII	Sides of sectors
RADII	Many lines on pie charts
RADII	They come from the center
RADII	Arm bones
RADII	Forearm bones

RADII	Lines going out in all directions
RADII	Spokes
RADII	Circle measures
RADII	Parts of forearms
RADII	They start in the middle
RADII	Hub-to-rim lines
RADII	They meet in the middle
RADII	Projections from a central point

RADII	Pie chart dividers
RADII	They have a central meeting place
RADII	Hub projections
RADII	Geometry calculations
RADII	Diameter halves
RADII	Angle producers
RADII	Rays
RADII	Sector sides

RADII	Lines on sonar screens
RADII	Semidiameters
RADII	Spoke more than once?
RADII	They form central angles
RADII	Math measurements
RADII	Diameters halved
RADII	Arms of a sort