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In fig. <AOB=2<ACB
in tri. AOB
2<ACB+2<BAO=180
<ACB+<BAO=90
given that <AOC=<BAQ
<BAQ+<BAO=90
<OAQ=90°
Hence AQ is tangent to the circle
in tri. AOB
2<ACB+2<BAO=180
<ACB+<BAO=90
given that <AOC=<BAQ
<BAQ+<BAO=90
<OAQ=90°
Hence AQ is tangent to the circle
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