ଦୁଇଟି ରେଖା AB ଏବଂ CD, O ରେ ବିଚ୍ଛେଦ ହୁଏ ଯଦି ∠AOC + ∠COB + ∠BOD = 270 °, ତେବେ ∠AOC =

1
70 °
2
80 °
3
90 °
4
180 °

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