Question

Please answer correctly with step by step eexplanation.I will mark you as Brainliest ​

Answer 1

18

Step-by-step explanation:

Let angle COD be x

So,BOC=4x

angle BOD=BOC+COD=90

4x+x=90

5x=90

x=90/5=18

Angle BOC =4*18=72

angle COD-angle BOC= angleAOB

angle COD = 90

Thus, 90-72= angle AOB

Angle AOB = 18