# How can the acos formula be used

**URL:** <https://forums.synfig.org/t/how-can-the-acos-formula-be-used/16896>\
**Category:** General\
**Created:** [January 19, 2026, 1:29am UTC](https://forums.synfig.org/t/how-can-the-acos-formula-be-used/16896 "2026-01-19T01:29:15Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![zainal](https://forums.synfig.org/user_avatar/forums.synfig.org/zainal/32/8504_2.png) [@zainal](https://forums.synfig.org/u/zainal)\
**Post date:** [January 19, 2026, 1:29am UTC](https://forums.synfig.org/t/how-can-the-acos-formula-be-used/16896/1 "2026-01-19T01:29:15Z")

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How can the acos formula be used? Is there another approach using different converters together?

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**Author:** ![rodolforg](https://forums.synfig.org/letter_avatar_proxy/v4/letter/r/c68b51/32.png) [@rodolforg](https://forums.synfig.org/u/rodolforg)\
**Post date:** [January 19, 2026, 2:23am UTC](https://forums.synfig.org/t/how-can-the-acos-formula-be-used/16896/2 "2026-01-19T02:23:13Z")

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Hm… If you want to know the angle between two vectors, use Dot Product with them normalized.

If you don’t have the two vectors, you can fake them.

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<div class="post-metadata">

**Author:** ![zainal](https://forums.synfig.org/user_avatar/forums.synfig.org/zainal/32/8504_2.png) [@zainal](https://forums.synfig.org/u/zainal)\
**Post date:** [January 22, 2026, 1:56am UTC](https://forums.synfig.org/t/how-can-the-acos-formula-be-used/16896/3 "2026-01-22T01:56:13Z")

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Thank you for answering my question