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 singular form of "that" is "it."
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 "cuffs" is cuff.
The singular form of binoculars is "binocular."