Question

pls tell the answer the value of a+b​

Answer 1

Answer:

in this figure ΔOBC is a triangle in which, OB = OC = BC

which make this triangle equilateral triangle because OB and OC is radii of circle and BC is a chord.

we know that angles of equilateral triangle is 60° so ∠O=∠B=∠C=60°

now, ∠A ≈1/2∠O                          (angle-subtented property)

       ∠A ≈1/2×60°

       ∠A≈30°

Now, ∠A±∠B

         ≈30°±60°

         ≈90°    

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Thank you