Explanation:
When used as adjective, it's 'six-foot tall', but often 'six-foot' is accepted. 'Six foot tall' without hyphen is sometimes used, but the standard is 'six-foot-tall' or 'six feet tall' (not as adjective). So 'six foot' might be error if not hyphenated. I'll say no error; many accept 'six foot tall'.
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