# Theorem of Pythagoras and perpendicular vectors

> When two forces act perpendicular to each other (at 90°), neither the simple addition nor subtraction of their magnitudes gives the correct resultant. Instead, the theorem of Pythagoras gives the…

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## More in Vectors and resultant of forces

- [Co-linear and co-planar vectors](https://www.hlayiso.com/grade-11/technical-sciences/notes/vectors-and-resultant-of-forces/co-linear-and-co-planar-vectors) — Next section
- [All Vectors and resultant of forces sections](https://www.hlayiso.com/grade-11/technical-sciences/notes/vectors-and-resultant-of-forces)

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