TP and TQ are the tangents to a circle with Centre O so that <POQ=100°, then <PTQ is
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As OP is perpendicular to TP
So, /_TPO = 90
As OQ is perpendicular to TQ
So, /_TQO = 90
IN QUADRILATERAL OPTQ
/_TPO + /_TQO + /_POQ + /_PTQ = 360
90 + 90 + 100 + /_PTQ = 360
/_PTQ = 360 - 280 = 80
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this is correct......................
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