# \#geom

**URL:** https://discourse.itk.org/tag/geom/149.md

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## [Rotation angle of Z-axis](https://discourse.itk.org/t/rotation-angle-of-z-axis/2817)

<div class="topic-metadata">

**Author:** [@spinicist](https://discourse.itk.org/u/spinicist)\
**Replies:** 3\
**Last updated:** [March 18, 2020, 4:55pm UTC](https://discourse.itk.org/t/rotation-angle-of-z-axis/2817 "2020-03-18T16:55:12Z")

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Hello, I have an itk::Transform (specifically an itk::AffineTransform). I would like to know how much this transform rotates the Z-axis - i.e. the angle between (0,0,1) and the result of applying the transform to (0,0,1…