Question

_ पार्श्वचित्र में 0 वृत्त का केन्द्र है। ZBAC का मान 40° है। तो ZOBC
तथा ZOCB का मान ज्ञात कीजिए।​

Answer 1

Question :--- we have to find angle OCB ?

Given :- angle BAC = 40°

we know that, angle at centre is double of angle at circumference .

so,

angle BOC = 40 × 2 = 80°

now,

∆BOC is isosceles ∆ as BO=OC = radius of circle ...

so,

angle OBC = angle OCB = (180-80)/2 = 50° (Ans)

(Hope its help you )