radii
Center-to-edge measures
Radii is the plural of radius.
A radius is the distance from the center of a circle to its edge, or a line segment representing that distance.
The word extends to any straight line from a central point outward: The blast damaged buildings within a half-mile radius.
In anatomy, the radius is one of the two bones of the forearm.
Distance across through center
- circumferenceCircle's outer measurement
- chordNotes sounded simultaneously
- arcCurved line segment
- sectorDistinct division of whole
tangent · secant · annulus · disk · ring · semicircle · quadrant · pie chart
Inner forearm bone
- forearmArm's lower half
- bonesRigid internal support structure
- wristHand-forearm connection
- elbowArm's middle joint
carpals · articulation · fractures · orthopedics · skeletal · osteology · joints · humerus
Curved line segment
- camberDesigned surface curvature
- bendCurve or flex
- sweepBrush clean with broom
- curveSmooth, angleless line
turning · wheel · spoke · hub · axle · tire · rim · circular motion
Point where edges converge
- angleGeometric measure of rotation
- polygonMultisided plane figure
- hexagonSix-sided closed figure
- octagonEight-sided polygon
pentagon · triangle · conic · ellipse · perpendicular · bisector · Euclidean · coordinate
Measure of extent
- calipersAdjustable-jaw measuring device
- micrometerMillionth of a meter
- gaugeStandard of measurement
- millimeterThousandth of a meter
centimeter · metric · scale · precision · dimensions · vernier · distance · span
diameter
Distance across through center
- circumferenceCircle's outer measurement
- chordNotes sounded simultaneously
- arcCurved line segment
sector · tangent · secant · annulus · disk · ring · semicircle · quadrant · pie chart · compass
ulna
Inner forearm bone
elbow · carpals · articulation · fractures · orthopedics · skeletal · osteology · joints · humerus · rotation
arc
Curved line segment
curve · turning · wheel · spoke · hub · axle · tire · rim · circular motion · angular
vertex
Point where edges converge
octagon · pentagon · triangle · conic · ellipse · perpendicular · bisector · Euclidean · coordinate · vector
length
Measure of extent
- calipersAdjustable-jaw measuring device
- micrometerMillionth of a meter
- gaugeStandard of measurement
millimeter · centimeter · metric · scale · precision · dimensions · vernier · distance · span · extent
radiidiameters
Widths through centers
circumferences · chords · tangents · secants · arcs
- radiant heatingSurface-emitted thermal energy
- background radiationResidual energy from early universe
- X-ray radiationShort-wavelength electromagnetic emission
- radiant heatersDevices emitting warming electromagnetic waves
- blast radiusArea affected by explosion
- nuclear radiationEnergy from atomic decay
radiant, radiate, radiance, radiation, radiator, radial, radius, radioactive, radiating