JAMB - Geography (2018 - No. 39)
An instrument used for setting out right angle in surveying a parcel of land is
Measuring rod
Abney level
A ranging pole
Theodolite
An optical squarer
คำอธิบาย
Surveying or land surveying is the technique, profession, and science of determining the terrestrial or three-dimensional positions of points and the distances and angles between them