正せい三さん角かく形けいMeaningsNoun1. equilateral triangle; regular triangleOther readings正せい三さん角かっ形けいKanji used正correct三three角angle形shapePitch accentせいさんかくけいComposed of正せい(logical) true; regular; 10^40; ten duodecillion; original; positive; greater than zero; thesis (in dialectics)Noun三さん角かく形けいtriangleNoun