radiuses

Distances from centers

Radiuses is the plural of radius—the distance from the center of a circle to its edge, or a bone in the forearm.

While radii is the traditional Latin plural, radiuses has become common in everyday usage: The radiuses of the two circles differ by three inches.

Both forms are correct.

geometry

diameter

Distance across through center

circumferenceCircle's outer measurement
arcCurved line segment
chordNotes sounded simultaneously

tangent · secant · circle · sphere · cylinder · cone · perimeter · area · pi · bisector

curvature

arc

Curved line segment

bendCurve or flex
curveSmooth, angleless line
sweepBrush clean with broom

bow · camber · convexity · concavity · curvilinear · roundness · circular · wheel · disk · ring

distance

range

Extent of variation

spanDistance between endpoints
reachExtend to touch
extentRange or magnitude

scope · proximity · separation · interval · coverage · perimeter · boundary · limit · threshold · spread

measurement

calipers

Adjustable-jaw measuring device

micrometerMillionth of a meter
rulerOne who governs
gaugeStandard of measurement

vernier · protractor · tape · precision · millimeters · centimeters · inches · meters · scale · dimension

Opposites

geometric measurement

radiusesdiameters

Widths through centers

circumferences · perimeters · chords · arcs · tangents

forearm anatomy

radiusesulnas

Inner forearm bones

Phrases

blast radiusArea affected by explosion
turning radiusSmallest circular path possible
turn radiusMinimum curve measurement
Schwarzschild radiusBlack hole's critical boundary distance

Family

Familiarity: Top 500,000
Profile: Used worldwide · Timeless · Everyday, not technical · Rated G