This is the 16067th most frequent Russian word.
радиусом
"Радиусом" means "by (a) radius" or "with (a) radius" in English.
In this sentence, 'радиусом' is used to specify the measurement of the circle's radius, indicating its size.
Круг имеет радиусом три метра.
The circle has a radius of three meters.
Here, 'радиусом' describes the approximate measurement of the curvature of the motion trajectory.
Траектория движения была радиусом около пяти метров.
The trajectory of motion had a radius of about five meters.
In this example, 'радиусом' expresses the determined measurement of the sphere's radius.