दी गई आकृति में एक वृत का केंद्र O है तथा ∠OAB = 60° तब ∠CDA = ? - - Dee Gayi Aakriti Me Ek Vrit Ka Kendra O Hai Tatha ∠OAB = 60° Tab ∠CDA = ? Maths in hindi, circles 40° question answers in hindi pdf 90° questions in hindi, Know About 60° Maths online test Maths notes in hindi quiz book 120°