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**Howto set Arc Ratio with Constrain "Length / Arc Ratio"?**

*(by Geert Hospers)*

In the attached file I want to make angle between line 1 and line 2 twice as large as the angle between line 2 and line 3.

How should that be done with Constrain "Length / Arc Ratio"?

I would expect that it works the same way as with:

Equal Length / Radius / Angle

This constraint forces two lengths, angles, or radiuses to be equal.

The equal-angle constraint requires four vectors as input: the two equal angles are the angle between each pair of inputs. For example, select line segments A, B, C, and D. The constraint forces the angle between lines A and B to be equal to the angle between lines C and D.

How should that be done with Constrain "Length / Arc Ratio"?

I would expect that it works the same way as with:

Equal Length / Radius / Angle

This constraint forces two lengths, angles, or radiuses to be equal.

The equal-angle constraint requires four vectors as input: the two equal angles are the angle between each pair of inputs. For example, select line segments A, B, C, and D. The constraint forces the angle between lines A and B to be equal to the angle between lines C and D.

**(no subject)**

*(by Geert Hospers)*

Probably I misunderstood that an arc is not an angle, but something that has a Length = Angle_in_radians * Radius.

The problem remains: how can I set the ratio between angles?

The problem remains: how can I set the ratio between angles?

**(no subject)**

*(by Paul)*

If you have two arcs with equal radius, setting a length ratio should give you that same ratio between the angles. You can add a construction line/arc if you need the existing arcs to be different radius.

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