Which strand of DNA is USED to make a copy of the other during RNA transcription?

I'm so confused. I look all over the internet and it all says that a copy (RNA) of the coding strand is made by the polymerase using the noncoding strand to make it. My bio teacher i think is saying the opposite. He says that when the polymerase goes along the DNA, unwinds a section, and uses the coding strand to match up the nucleotides, making the sequence identical to the non coding (beside U and T). HELP.