the single form of radii is radius
Radius.
The plural form of radius is radii.
analysis itself is a singular form
The noun genius is the singular form, the plural form is geniuses.
The noun form 'cut' is singular; the plural form is 'cuts'.
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.
The noun radii is already a plural. The singular is radius.
radius
It is singular. The plural of "radius" is "radii" with two i's.
The plural form of radius is radii.
The singular form of the demonstrative pronoun 'these' is this.
A circle has radii or radiuses which are infinite
The singular form of "that" is "it."
The singular form is cuff.
The singular form of binoculars is "binocular."
"Stratum" is the singular form of stratum. The plural form is "strata".