radius
Radius.
the single form of radii is radius
The noun radii is already a plural. The singular is radius.
Classically, the plural should be radii, (usually pronounced ray-dee-eye) because 'radius' is a Latin word.However, in modern English, radiuses is acceptable.
It is singular. The plural of "radius" is "radii" with two i's.
The word radii has 3 syllables. They are: ra di i
the word 'radius-es' doesn't exist, the word 'radii' is the plural of 'radius'
A circle has radii or radiuses which are infinite
What the word congruent and circle have in common is that circles have a congruent radii. All of the radii in a single circle is congruent to each other.
radii
Radii is the plural of the word 'radius'. It comes from the Latin word of the same spelling meaning beam, staff or rod. Most European languages derived from Latin.
The plural of radius is radii. As in "the radii is a straight line extending from the centre of a circle to the circumference"