Question

please solve it class 9th math chapter 6a​

Answer 1

Answer:

Step-by-step explanation:

We know sum of adjacent angles is 180°. Since angle AOC= angle BOC ( given) and they form a linear pair

Let angle AOC and BOC both be x

AOC+ BOC= 180°

x+x =180°

2x=180°

x=90°

Hence Proved.

Answer 2

angle AOC + angle COB = 180'

angle AOC+angle AOC=180 ( angleAOC=angle COB)

2×angleAOC=180'

SO angle AOC=90' proved