正せい五ご角かく形けいMeaningsNoun1. regular pentagon; equilateral pentagonKanji used正correct五five角angle形shapeComposed of正せい(logical) true; regular; 10^40; ten duodecillion; original; positive; greater than zero; thesis (in dialectics)Noun五ごfive; 5Numeric角かく形けい-gon (as in pentagon, hexagon, etc.)Suffix