radius

• Substantivo que designa o segmento de reta que vai do centro até a circunferência de um círculo ou à superfície de uma esfera, ou o osso do antebraço, ou ainda um raio de roda.

A noun referring to a line segment from the center to the circumference of a circle or sphere, or the bone in the forearm, or a spoke of a wheel.

plural irregular

1. Distance from centerB1formalscientific

   The length of a straight line from the center of a circle or sphere to its outer edge or surface.

   Raio

   • The radius of the circle is five centimeters.
   • To find the area, multiply pi by the square of the radius.
   • The satellite orbits at a radius of 200 kilometers.

   Sinônimossemidiameter

2. Circular areaB2formalscientific

   A circular region defined by the distance from a central point.

   Raio

   • The explosion affected everything within a one-mile radius.
   • The school serves students within a five-kilometer radius.
   • They searched the area within a 10-mile radius of the crash site.

   Sinônimosareacirclerangeregionzone

3. Forearm boneB2formalmedical

   The outer and slightly shorter of the two bones in the human forearm, located on the thumb side.

   Rádio

   • He fractured his radius in a fall.
   • The radius and ulna are the two bones of the forearm.
   • The doctor examined the radius for signs of injury.

4. Wheel spokeB2formaltechnical

   A supporting rod or bar that connects the center of a wheel to its outer rim.

   Raio

   • The wheel's radius was bent in the accident.
   • Each radius of the wheel is made of strong steel.
   • The mechanic replaced the damaged radius on the bicycle wheel.

   Sinônimosspoke