radian

• Unidade de medida de ângulo plano no Sistema Internacional de Unidades, definida como o ângulo central subtendido por um arco de comprimento igual ao raio da circunferência, equivalendo a aproximadamente 57,295 graus.

A unit of plane angle measurement in the International System of Units, defined as the angle subtended at the center of a circle by an arc equal in length to the circle's radius, equivalent to approximately 57.295 degrees.

1. Unit of angleB2formalscientific

   The standard unit of angular measure used in mathematics and physics, equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees).

   Radiano

   • The angle of 180 degrees is equal to π radians.
   • In calculus, angles are typically measured in radians.
   • A full circle contains 2π radians.