# Diameter

Analyze

Diameter

The Diameter command reports the diameter of a curve at a specified point.

#### Steps

1. Move the mouse cursor along a curve.

The Units pane on the status bar reports the diameter of the curve at the current cursor location.

2. Pick a point on the curve.

The diameter and radius report to the command-line.

If the diameter and radius return "infinite", the curve is linear (no curvature) at the picked location, or has the shape of a line or a polyline.

Command-line options

SelectCurve

Limit the selection to a specified curve.

Press Enter to select any curve.

MarkDiameter

Places a point object at the evaluated point on a curve and creates a curvature circle through that point.

Units

Set the units for the length display.

This option is only available if no objects are selected.

Type subcrv to select part of a curve as input.

Analyze

The Radius command reports the radius of a curve at a specified point.

#### Steps

1. Move the mouse cursor along a curve.

The Units pane on the status bar reports the radius of the curve at the current cursor location.

2. Pick a point on the curve.

The diameter and radius report to the command-line.

If the diameter and radius return "infinite", the curve is linear (no curvature) at the picked location, or has the shape of a line or a polyline.

Command-line options

SelectCurve

Limit the selection to a specified curve.

Press Enter to select any curve.

Places a point object at the evaluated point on a curve and creates a curvature circle through that point.

Units

Set the units for the length display.

This option is only available if no objects are selected.

Type subcrv to select part of a curve as input.

##### Nesting the Length, Radius, and Distance commands

The Length, Radius, and Distance commands are nestable. This means that if Rhino is asking for a distance in a command, you can use these commands to measure another object or distance and the resulting value will be feed to the command as if you had typed the number.

#### Example using Offset

1. Start the OffsetSrf command.
2. At the prompt for the offset distance, type Length, Radius, or Distance, and press Enter.
3. Select a curve.
The offset distance will be set to that value.

#### Example using Fillet

1. Start the Fillet command.
2. At the prompt for the radius, type Length, Radius, or Distance, and press Enter.
3. Select a curve.
The fillet radius will be set to that value.