it came from Latin root words
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Radius is from the Latin root word radius, spoke of a wheel, a staff, a beam of light.
the word 'radius-es' doesn't exist, the word 'radii' is the plural of 'radius'
The word that is 2x the radius of a circle is Diameter.
Radius.
Marbles come in many different sizes. They range from about 0.65 cm in radius for normal marbles to 1.27 cm radius for shooters.