Question

Tell me the reason ,why we take 1/2 in any equation of maths .

I mean when we solve any question, like the chapter "triangle"

When we write 1/2 ab ,what is the condition we see that we put 1/2

Example :-angle BCO=1/2 angle BCD

See the eq in attachment

Answer 1

It is angle bisector 2( angle BCO ) = angle BCD