Mathematics for IGCSE & O level - Geometrical Constructions (Section 2 - No. 11)
What is the most important initial step when measuring an angle using a protractor?
Measuring the arms of the angle.
Estimating the angle's approximate measure.
Lining up the zero line with a vertex.
Using the correct protractor scale
คำอธิบาย
Estimate the angle size is the important initial step.