Ukubalwa kwee-angles ezisikiweyo zecandelo le-trapezoid ukusuka kumbhobho weprofayili
X - Ububanzi trapezoid phezulu.
Y - Ukuphakama kokwakha.
Z - Ezantsi ububanzi trapezoid.
E - Umbhobho weprofayili ubukhulu.
Iimpawu.
Ukubalwa kweengalo ezisikiweyo zokwenza ulwakhiwo ngendlela ye-trapezoid.