The tangent arc is a curve that touches the two circles at only one point. The tangent arc can be drawn by using the TRACE command.
The TRACE command can be used to draw a line, circle, ellipse, or an arc. It has four basic parameters: start point, end point, radius of curvature and rotation angle.
Start Point: The start point of the tangent arc is the center of one of the two circles.
End Point: The end point is at a distance from the center equal to the radius of curvature from an imaginary straight line between the two circles’ centers.
Radius of Curvature: This parameter specifies how close together or far apart to make points on either side of the tangent