 Udi nke ọgwụgwụ okpu-ekpebi ngwugwu si cross-sectional profaịlụ; Ya mere, ezi uche anya nkwakọ nwere ike e mere na a fọrọ nke nta-adịghị agwụ agwụ dịgasị iche iche nke profaịlụ, gụnyere cat anya, oval, gburugburu, rektangulu, square, na trapezoid. 