Add a Concentric Constraint
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A concentric constraint forces selected circles, arcs, or ellipses to maintain the same center point.

Apply a Concentric Constraint

In the example below, a concentric constraint has been applied to the two circles on the left. On the right, the circles share the same center point.

Manipulate a Concentric Constraint

When you manipulate a block with a concentric constraint applied, the specified circles, arcs, or ellipses will always share the same center point.

In the example below, the constrained ellipses on the top have been manipulated to produce the block on the bottom. The two ellipses can move, change shape, or change size, but will always be constrained to share the same center point.

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