Question

AOB= 80
THEN ADB =?
​

Answer 1

angle ADB is 140 degree

take a another point on upper circle and draw lines from A&B mark as P

angle APB is 40 degree

now,

APBD is cyclic quadrilateral

so, opposite angles sum will be 180 degree

angle APB+angleADB=180degree

180-40=angleADB

angleADB is140 degree

hope this will help you

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