[I am using the HK transliteration scheme] trikoNam (neuter) = triangle so we can have by analogy: polygon = bahukoNam or bahubhujam star = nakSatra more is not in your case translated verbatim as it is occurring as a comparative. difficult = guru and more difficult = garIyAn (masculine stem form) and garIyas (neuter stem). We need the neuter form since bahukoNam is neuter. so you have garIyAMsi bahukoNAni zrI yantram atha garIyAMsi bahukoNAni or a more pleasant sounding rearrangement of the same phrase: zrI yantram atha bahukoNAni garIyAMsi

Polygon = Sahasrabhuji; Poly = Sahasra (actually means thousand, or many. you can use "Aneka" also. Star = nakshathra more = anaeka difficult = kashtam