# How to measure length of arc instead of radius?

**URL:** <https://discourse.shapr3d.com/t/how-to-measure-length-of-arc-instead-of-radius/860>\
**Category:** Modeling Questions\
**Created:** [March 21, 2017, 5:03am UTC](https://discourse.shapr3d.com/t/how-to-measure-length-of-arc-instead-of-radius/860 "2017-03-21T05:03:00Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Moviti](https://avatars.discourse-cdn.com/v4/letter/m/838e76/32.png) [@Moviti](https://discourse.shapr3d.com/u/Moviti)\
**Post date:** [March 21, 2017, 5:03am UTC](https://discourse.shapr3d.com/t/how-to-measure-length-of-arc-instead-of-radius/860/1 "2017-03-21T05:03:00Z")

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How to measure length of arc instead of radius?

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**Author:** ![Istvan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/istvan/32/23668_2.png) [@Istvan](https://discourse.shapr3d.com/u/Istvan)\
**Post date:** [March 21, 2017, 6:06am UTC](https://discourse.shapr3d.com/t/how-to-measure-length-of-arc-instead-of-radius/860/2 "2017-03-21T06:06:03Z")

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Currently you can’t do that. We should improve the geometry info tool to display this as well.

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**Author:** ![Moviti](https://avatars.discourse-cdn.com/v4/letter/m/838e76/32.png) [@Moviti](https://discourse.shapr3d.com/u/Moviti)\
**Post date:** [March 21, 2017, 6:12am UTC](https://discourse.shapr3d.com/t/how-to-measure-length-of-arc-instead-of-radius/860/3 "2017-03-21T06:12:49Z")

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Thank you for your quick response. I hope I can use the function as soon as possible.

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**Author:** ![Wookiee](https://avatars.discourse-cdn.com/v4/letter/w/57b2e6/32.png) [@Wookiee](https://discourse.shapr3d.com/u/Wookiee)\
**Post date:** [September 19, 2023, 4:57am UTC](https://discourse.shapr3d.com/t/how-to-measure-length-of-arc-instead-of-radius/860/4 "2023-09-19T04:57:36Z")

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Are we still not able to do this?

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**Author:** ![gex](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/gex/32/35639_2.png) [@gex](https://discourse.shapr3d.com/u/gex)\
**Post date:** [September 19, 2023, 5:22am UTC](https://discourse.shapr3d.com/t/how-to-measure-length-of-arc-instead-of-radius/860/5 "2023-09-19T05:22:08Z")

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honestly, why don’t you try it?

at the bottom you can see:

- the angle
- the length of the arc = (2 \* r \* pi) / 2 = r \* pi = 5 \* pi = 15.707963, correct)
- and the radius at the end

 ![Screenshot 2023-09-19 at 7.18.25](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/d/1/d1e9f4f7c8281c3f9a578cc10d2e32a470095dae.jpeg)

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**Author:** ![Wookiee](https://avatars.discourse-cdn.com/v4/letter/w/57b2e6/32.png) [@Wookiee](https://discourse.shapr3d.com/u/Wookiee)\
**Post date:** [September 19, 2023, 2:21pm UTC](https://discourse.shapr3d.com/t/how-to-measure-length-of-arc-instead-of-radius/860/6 "2023-09-19T14:21:26Z")

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Yes! If I have a simple line, I can use the method you show. But as a relative novice, I expected to tap the ends of my arc with the measure tool. (parabolic nature, and not circular in nature) and get a length from one end to other.

 ![IMG_0526](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/0/0/00f2351b443c7e5e2e9093a66de478f057c98673.jpeg)

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**Author:** ![gex](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/gex/32/35639_2.png) [@gex](https://discourse.shapr3d.com/u/gex)\
**Post date:** [September 19, 2023, 4:24pm UTC](https://discourse.shapr3d.com/t/how-to-measure-length-of-arc-instead-of-radius/860/7 "2023-09-19T16:24:06Z")

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selecting 2 points does not necessarily define one path because there can be other connected edges, arcs, lines, etc. but you can select all edges you’d like to know the length of and the app will calculate the total for you.

 ![Screenshot 2023-09-19 at 18.19.27](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/a/7/a759ae51bbb5a5f9a6232bc1515bd22819805642.jpeg)