In the given figure, if RPS = 25o, the value of ROS is _________.

Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 155o
According to the question,
in quadrilateral OSPR,
⇒ ∠ P + ∠ S + ∠ O + ∠ R = 360°
⇒ 25° + 90° + ∠ O + 90° = 360°
⇒ ∠ ROS = 360° - 205° = 155°