Angle between two planes

[mammothrob]

I have the equations for two planes so I can read the normal vectors from both.

I read on a math page that the angle is same at the angle between the those normal vectors.

So i used the the formula

Cos(Q) = the dot of the vectors / the product of the magnitude of the vectors

it just seems way too easy... do I need to use unit vectors for the formula or is my work right.

Rob

 

[JakeD]

I have the equations for two planes so I can read the normal vectors from both.

I read on a math page that the angle is same at the angle between the those normal vectors.

So i used the the formula

Cos(Q) = the dot of the vectors / the product of the magnitude of the vectors

it just seems way too easy... do I need to use unit vectors for the formula or is my work right.

Rob

It is that easy. Dividing by the magnitudes handles non-unit vectors. If you use unit vectors, the magnitudes will equal 1.

 

[mammothrob]

nice

thanks