what is radial direction
Best Answer: the 'radius' of a circle is the distance from the center to the outside of the circle. anything that is in the direction from the center of the circle outward toward the circle is 'radial'. if you tie a rock to the end of a string and twirl it above yor head, the string is oriented radially. the 'tangent' of a circle is the line drawn at a 90 degree angle to the radius at any point on the circle.