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For class of 10 students, a teacher plan...

For class of 10 students, a teacher planned a game for the revision of chapter circles with some questions written on the board, which are to be answered by the students. For each correct answer, a student will get a reward. Some of the questions are given below.

If PA and PB are two tangents drawn to a circle with centre O from P such that `angleAPB= 50^(@)`, then `angleOAB`=

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