Specify arc radius and circle diameter

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You can create radial dimensions to indicate the

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radius and diameter of arcs and circles.

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And you can control the layer on which the dimension is created

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on the home ribbon

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in the layers panel note that layer zero is the current layer.

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When you expand the layer drop down,

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you can see that the drawing already includes a layer called dimensions.

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Someone else already created this layer and assigned it the color cyan

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dimensions are created using the current dimension style

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on the annotate ribbon.

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In the dimensions panel,

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you can see that annotative is the current dimension style.

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You could expand this drop down and choose a different style

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or create a new style

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in the dim layer override. Drop down.

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The program is currently set to create new dimensions on the current layer

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which is layer zero,

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expand this drop down and select the dimensions layer

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so that any new dimensions will be created on that layer

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on the annotate ribbon

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in the dimensions panel, click the dimension tool,

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the program prompts you to select objects

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or specify the first extension line origin.

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And there are a number of options

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to dimension the radius of an arc such as the arc on the left side of the object

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hover the cursor over that arc,

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you immediately see a preview of the dimension

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and the program prompts you to select the arc to specify its radius.

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Click to select the arc,

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the program then prompts you to specify the radius dimension location

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as you move the cursor the preview updates so that it is right or left justified

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when you are satisfied with its location.

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Click to place the dimension

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note that the resulting dimension includes the letter R as

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a prefix to identify this as a radial dimension.

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And a center mark has been added at the center of the arc.

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The inclusion and appearance of these elements

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is determined by the dimension style.

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The command remains active. So you can place another dimension

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to dimension the diameter of the circle

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hover the cursor over that object.

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You immediately see a preview of the dimension

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and the program prompts you to select the circle to specify its diameter.

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Click to select the circle.

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The program then prompts you to specify the diameter location.

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And again as you move the cursor,

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the preview updates so that it is left or

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right justified depending on where you move the cursor

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when you are satisfied with its location,

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click to place the dimension

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this time,

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the dimension includes a diameter symbol and a center mark

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has been added at the center of the circle.

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Again, the command remains active. So you can place another dimension.