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 plural form for the singular noun radius is radii or radiuses, both are now accepted.
Radius is the singular. The plural is Radii. 1 radius, more than 1 Radii.
The plural form of radius is radii or radiuses. Both forms are accepted.
The noun 'radii' is the plural form of the singular noun 'radius'.
Assuming that the question is seeking the plural for radius rather than "plaurl" for "radious", the answer is radii.
The plural noun of "Radius" is "Radii"
Radii is plural. Radius is singular.
radiuses
Radii.
It is singular. The plural of "radius" is "radii" with two i's.
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 plural form of a singular woman is women.
The singular noun is mass. The plural form is masses.
The plural of "she" is "they", so the plural of "she had" is "they had".
The noun radii is already a plural. The singular is radius.
It is singular. The plural of "radius" is "radii" with two i's.
the single form of radii is radius
The plural form of radius is radii.
Radius.
The plural of radius is radii. As in "the radii is a straight line extending from the centre of a circle to the circumference"
This is singular. These is the plural form.
The plural form of a singular woman is women.
The singular noun is mass. The plural form is masses.
Vita is singular. The plural form of vita is vitae
The plural of "she" is "they", so the plural of "she had" is "they had".
The singular form is it, the plural form is they(subjective) and them (objective).