The two objects were arranged (orthogonal | orthogonally) to each other.
Does "orthogonal" relate to the verb, or to the two objects? In other words, do I need to use the adverb or the adjective?
Learn English – Adjective or adverb after “arranged”
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Best Answer
If you restructure the sentence, you could use either form, but in its current form you should use the adverb because you are describing how the objects are arranged, not simply describing the objects themselves. "Orthogonally" answers the question, "How were the objects arranged?".