This is a picture I took of my brother in a nurse hat. On the hat is a cross, this cross is not only a vertical angles but it is a symbol for the medical industry. A red cross in wartime was a symbol for medical personal, so now everywhere there are people to help the wounded there are red crosses. That's why on hospital signs there are red crosses. A red cross is not only the symbol for medical personnel , it is a vertical angle. Vertical angles the congruent angle opposite each other when two lines cross. So there are two sets of vertical angles in the cross sign on my brothers hat.
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