The_FD

just wondering what is best:

perpendicularly to
perpendicularly from

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I guess it's the first option:
perpendicularly to

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Framboise

It depends on the verb:

a. to be + adjective: A is perpendicular + to B
b. other verbs such as: locate, intersect, pass smth + adverb: perpendicularly to

In this case perpendicularly indicates the position of A to B.

c. If perpendicularly is followed by the preposition from, it will not necessarily mean that "from" is related to "perpendicularly", but it is rather related to the verb used in that sentence.

e.g. extending, projecting, removing something perpendicularly from something else or from somewhere.
In this case, perpendicularly indicates the manner in which something is done.

"Fibrous structure does not always extend perpendicularly from bone."

The_FD

Thanks Framboise for being so helpful

I guess in may case I'll just have to use "to" but i'd like to know what you think:

"A" varies throughout the area in two directions: both in an axial direction and perpendicularly to the axis

__________________
L'histoire de la famille Bourdillon
Les fêtes d'Hébé
The flying dancer dancing

Framboise

You are welcome!

"A" varies throughout the area in two directions: both in an axial direction and perpendicularly to the axis

This is doubly correct !

1. because 'to' is the usual preposition for 'perpendicular', and
2. because of ' varying in two directions' (direction + to)