एक कोण BAC को समद्विभाजित करने की प्रक्रिया में, हम बिंदुओं D और E (जहाँ D और E, A से समान दूरी पर भुजाओं AB और AC पर स्थित बिंदु हैं) से चाप क्यों खींचते हैं?

In manual drafting, when a line needs to be divided into equal segments without relying on a graduated scale, which classical geometric technique is used to achieve precise proportional divisions?

Arrange the following steps in the correct order to construct an equilateral triangle with each side 35 mm. 1. Join CA and CB. 2. Draw a line and mark AB as the side of the triangle at 35 mm. 3. With radius AB and centers A and B, draw an arc intersecting at C. 4. ABC is the required triangle.