In the context of the movie "Radius," a radius refers to the distance from a central point within which a specific effect occurs. In the film, the protagonist discovers that anyone who comes within a certain radius of him dies instantly. This concept of radius serves as both a physical and metaphorical boundary, highlighting themes of isolation, fear, and the unintended consequences of proximity. It plays a crucial role in the plot, driving the character's quest to understand and cope with his deadly condition.

In geometry, the **radius** is the distance from the center of a circle to any point on its circumference. The **diameter** is the distance across the circle, passing through the center, and is twice the length of the radius. Therefore, if the radius is "r," the diameter is "2r." In the context of the movie "Radius," the concept of radius can metaphorically relate to personal boundaries and the impact of a character's presence, as it explores themes of connection and isolation.

In the context of the movie "Radius," the term "radius" refers to a specific distance from a central point that affects the characters' situations. To calculate a radius in general terms, you can use the formula for a circle: \( r = \frac{C}{2\pi} \), where \( r \) is the radius and \( C \) is the circumference. Alternatively, if you have the area \( A \) of a circle, the radius can be calculated using \( r = \sqrt{\frac{A}{\pi}} \). In practical terms, the radius is simply the distance from the center to the edge of a circle.

In the context of the movie "Radius," the term "radius" refers to a character's mysterious ability that creates a deadly radius around them, affecting anyone who comes too close. Anatomically, the radius is one of the two long bones in the forearm, located on the same side as the thumb. It runs parallel to the ulna and plays a crucial role in wrist movement and forearm rotation. In the film, however, the focus is on the supernatural aspect of the radius rather than its anatomical definition.