Mezue nkebi ahịrịokwu a: Na narị afọ nke iri na asatọ, nkà mmụta sayensị nke iji ihe osise eme ihe mere nnọọ ngwa ngwa, e jikwa triangle mee ihe n'ọtụtụ mba. Na United Kingdom nke Netherlands, General Krayenhoff mechara nyocha dị otú ahụ, ma ndị isi ndị agha nke ndị agha nke ndị agha nke ndị agha nke ndị agha nke ndị agha nke ndị agha nke ndị agha nke ndị agha nke ndị agha.
Ntughari nke Belgium gbochiri mmezu ya na Belgium. Craan nyere aka inye mgbalị a ume ọhụrụ. Isi onyinye ya bụ "Plan Géométrique de la ville de Bruxelles avec ses faubourgs et communes limitrophes" (na 4 folios, 1836). O mere atụmatụ obodo a n'afọ 1821.