0 a device used for measuring and drawing angles. It is usually in the form of half a circle made from transparent plastic with degrees printed on it. -- 量角器；分度規
Using a protractor we were able to make an estimate of the angle of one of the air wedges: 37 (0.645 radians).
The angle of flexion of a whole finger with 3 joints was measured with a protractor.
The angle between the 2 metal sides was measured with a protractor, estimated accuracy 1x (3 measurements, averaged).
This instrument, which was constructed from a precision protractor and sensitive bubble level, was accurate t o within 0.05".
By contracting the transverse muscles (and the action of protractor muscles), the foot becomes narrow and elongated causing it to penetrate the substrate.
The angle of inclination relative to the horizontal of the petiole, lamina and drip tip of each leaf was measured using a transparent plastic protractor and a plumb line.
The angle of pulmonary artery bifurcation was measured by a hand-held protractor from the recorded image by extrapolating straight lines along the medial walls of the branch arteries.
One ran, as it were, with the protractor alongside, knowing that in many cases the long jump depended on height and not length.
