# Angle Planes measurement

**URL:** <https://discourse.slicer.org/t/angle-planes-measurement/8545>\
**Category:** Support\
**Created:** [September 24, 2019, 12:27pm UTC](https://discourse.slicer.org/t/angle-planes-measurement/8545 "2019-09-24T12:27:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Thom](https://avatars.discourse-cdn.com/v4/letter/t/57b2e6/32.png) [@Thom](https://discourse.slicer.org/u/Thom)\
**Post date:** [September 24, 2019, 12:27pm UTC](https://discourse.slicer.org/t/angle-planes-measurement/8545/1 "2019-09-24T12:27:47Z")

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Hi!  
Im using the angle planes extension to try to measure an angle between the lateral semicircular canal and the vestibular aqueduct. I marked the wanted angle in the picture. The extension shows me 3 angles(pitch,yaw,roll), which one of these angles is the one i wanted and how do i know?  
Thanks!

 ![Angle](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/9/6/9672aeb68974cde629fc179a7b38f86128508158.png)

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [September 24, 2019, 12:50pm UTC](https://discourse.slicer.org/t/angle-planes-measurement/8545/2 "2019-09-24T12:50:00Z")

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You can compute angle between planes in several different ways. If you need angle between plane normal vectors then copy-paste this code snippet in the Python interactor: [https://www.slicer.org/wiki/Documentation/Nightly/ScriptRepository#Measure\_angle\_between\_two\_slice\_planes](https://www.slicer.org/wiki/Documentation/Nightly/ScriptRepository#Measure_angle_between_two_slice_planes)