1. Cov qauv kev cog lus: nws yog hais txog cov khoom uas tshwm nyob rau ntawm lub hau ntawm lub hau yuav kis tawm.
2. Ntaus hom: nws yog hais txog qhov loj ntawm sab saum toj thiab hauv qab ntawm pawg (cov khoom ntawm pawg yog trapezoid lossis cov khoom nyob saum npoo yog trapezoid).
3, tshwj xeeb hom: qhov dav dav ntawm pawg taub hau yog square, yog hais tias txoj hauj lwm ntawm lub taub hau pawg tsis zoo heev, thiaj li yuav ua kom qhov kev ua tau zoo ntawm cov khoom thiab cov neeg nyiam, cov tswv lag luam muaj peev xwm muab ntau daim duab tshwj xeeb pawg taub hau raws li mus rau kev ntim khoom ntawm cov khoom thiab qhov kev xav tau ntawm qib kev nce qib
