Question

Find A and B, pls tell its urgent.........

Answer 1

Answer:

b=70°, a=140°

Step-by-step explanation:

a=2b(angle subtended by an arc at the centre of a circle is twice that of circumference)

Reflex <AOB = 360°-2b (angles at a point)

b+30°+40°+360°-2b=360° (sum of angles in a quadrilateral)

=> -b = -70° => b=70°

Recall: a = 2b => a= 2×70° = 140°