Arcs are dimensioned with a _____ to identify the _______.

Arcs are dimensioned with a leader to identify the radius. This approach is used in technical drawing and engineering design to provide clarity and precision. The leader is a line that connects the dimension to the arc while ensuring that the measurement does not clutter the drawing.

Dimensioning arcs specifically with a radius is important because arcs can be part of circular features, and the radius gives the necessary information about the size of the curve. This allows anyone interpreting the drawing, including engineers, architects, or contractors, to understand how the arc should be constructed or fabricated in relation to the overall design.

Using a leader line is a common practice in drafting standards and keeps the drawing organized, ensuring that the dimensions are readily visible and easily understood.