दी गई आकृति में वृत का केंद्र O है तथा ∠ACB = 40° है तब ∠AOB = ? - - Dee Gayi Aakriti Me Vrit Ka Kendra O Hai Tatha ∠ACB = 40° Hai Tab ∠AOB = ? Maths in hindi, circles 40° question answers in hindi pdf 60° questions in hindi, Know About 30° Maths online test Maths notes in hindi quiz book 80°