Mathematics for IGCSE & O level - Geometrical Constructions (Section 3 - No. 7)
Which of the following is essential when using a protractor?
Placing the protractor's center on the angle's vertex.
Aligning the 0° line with one arm of the angle.
Reading the scale carefully.
Using a pencil.
解释
Correct protractor usage involves these key steps for accurate measurement.