はんけい半径hankei
1.

A line segment that connects the center of a circle or sphere to a point on its circumference or surface, representing the distance from the center to that point, and is half the length of the diameter.

2.

The length of the line segment that extends from the center of a circle or sphere to any point on its boundary, often used in geometry to define the size of the shape.

3.

In geometry, it refers to the measurement that describes how far the boundary of a circle or sphere is from its central point, providing a key parameter for calculating area and volume.

こうどうはんけい行動半径koudouhankei
1.

The distance or range within which an individual or entity can conduct activities or actions without the need for external support or resources, often referring to the capabilities of military vehicles or equipment in operational contexts.

2.

The extent of area that a person or animal can effectively engage with or influence, encompassing the physical space as well as the social and experiential dimensions of their interactions and decisions.

3.

A concept that reflects the limits of an individual's or group's operational capabilities, including both geographical movement and the related social or cognitive dimensions that constrain or enable particular actions.

かいてんはんけい回転半径kaitenhankei
1.

The distance from the center of rotation to the path traced by an object in rotational motion.

2.

A measure of how mass is distributed around an axis, calculated as the square root of the moment of inertia divided by the total mass of the rigid body.