Okokulinganisa nokuhlola ama-engeli. Ithweswe iziqu ngo-mm nama-intshi ukuze isetshenziswe indawo yonke. Umthetho wensimbi ongu-300mm one-protractor ebuyiseleka emuva, i-engeli eguquguqukayo nekhanda elimaphakathi. I-angle ledge kanye ne-protractor zombili zihlanganisa izinga lomoya.
| Imininingwane | |
| Ukufundwa kwe-Protractor | 0-180 degrees |
| Ubude bomthetho wensimbi | 300 mm |
| Ubude bekhanda eliyisikwele | 110 mm |
| Ubude bekhanda elimaphakathi | 62 mm |