正せい三さん角かく錐すいMeaningsNoun1. triangular pyramid with equilateral baseOther spellings正せい三さん角かくすいUsage share unknownKanji used正correct三three角angle錐awlComposed 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triangle; triangular shapeNoun錐すいcone; pyramidNoun