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From Karnataka Open Educational Resources
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#Angle subtended by equal sides are equal.
 
#Angle subtended by equal sides are equal.
 
==Algorithm==
 
==Algorithm==
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In the above figure AB is direct common tangent to two circles and PQ is the Transverse common tangent.<br>
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'''Step-1''''''Bold text'''<br>
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AQ=QP and BQ=QP  (Tangents drawn from external point are equal)<br>
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By axiom-1, AQ=BQ<br>
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∴tangent at P bisects AB at Q.