Answers

2015-12-23T19:05:29+05:30
We know that ,
OPT=90°
OPQ=90-QPT°⇒equation1
in ΔPQT
PTQ=180-2QPT                   IF 2 IS TAKEN AS COMMON
PTQ/2=90-QPT⇒EQUATION 2
From equations 1 and 2
PTQ/2=OPQ                              AS R.H.S are equal
PTQ=2OPQ
hence proved.
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