Question

class 9 ch 6 maths ex 6.1 ​

Answer 1

From the diagram, we have

(angle AOC+angle BOE+angleCOE) and

( angle COE + angle BOD + angle BOE) forms straight line

So,

angle AOC+ angle BOE+ angle COE= angle COE + angle BOD + angle BOE=180°

Now, by putting the values of

angle AOC+ angle BOE =70°

angle BOD=40°

We get,

angle COE = 110° and angle BOE=30°

So,

reflex

angle COE=360°-110°=250°