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In this lesson
you will learn about sketch dimensions

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in the contextual sketch environment.

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You can use sketch dimensions

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to control the size
and position of your geometry.

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The default shortcut for sketch
dimensions is D.

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It's easy to add dimensions
for different types of geometry.

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Just press relevant lines or points
in your geometry and add a value.

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A dimension can both be driving
and driven.

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Driving
dimensions are the default dimension type.

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Those dimensions drive your design.

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For example, when I make this line
100mm, the design updates.

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Your dimension will be driven
if the sketch becomes overconstrained.

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For example,
this perpendicular constraint indicates

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that the angular degree
between the lines will be 90 degrees.

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Therefore, I can't add a dimension here
that breaks to rule.

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Your dimension will be driven, flexible,
and determined by other dimensions.

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This dimension is presented
in parenthesis and grayed out.

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You can reference dimensions.

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This is useful
when you work with parametric modeling

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and can save you a lot of time
and increase quality

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since the probability of mistakes
can decrease.

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I'll use a circle in this example, but
other types of geometry are fine as well.

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Add a dimension to the first circle.

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Add another dimension to the second circle
and click the first dimension.

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fx indicates
that this is a referenced dimension.

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Change the first dimension
and the second dimension

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follows.

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You can add formulas to dimensions.

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Imagine that you want this circle
to always be

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20% larger than the referenced circle.

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Select your reference times 1.2 or 1,2.

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Your formula is okay
if the text turns black.

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And that's it for dimensions for now.

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We'll put it more into practice
later in the course.

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Thank you.