Radius.
The plural form of radius is radii.
analysis itself is a singular form
The noun form 'cut' is singular; the plural form is 'cuts'.
The noun genius is the singular form, the plural form is geniuses.
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.
A circle has radii or radiuses which are infinite
The singular form of the demonstrative pronoun 'these' is this.
The plural of radius is radii. As in "the radii is a straight line extending from the centre of a circle to the circumference"
The singular form of "that" is "it."
The singular form of "cuffs" is cuff.
The singular form of binoculars is "binocular."