In the given figure $TP$ and $TS$ are tangents to the given circle $r$ is point of circumference
im trying but i could't find any idea and i forget my geometry knowledge please can some help this problem
thank you so much
In the given figure $TP$ and $TS$ are tangents to the given circle $r$ is point of circumference
im trying but i could't find any idea and i forget my geometry knowledge please can some help this problem
thank you so much
$\angle PRS = \angle TPS $ by inscribed angle theorem
$\angle TPS = \angle TQP$ by your definition of $Q$
So, we have $\angle PRS = \angle TQP$ and that means that $TQ||SR$ (corresponding angles)
To prove 7.2 note that $\angle TSP = \angle TPS = \angle TQP$ and so TPQS is inscribed (it is equivalent to $\angle TSP = \angle TQP$)
To prove 7.3 note that we know that TPQS is inscribed, so $\angle TPS = \angle TQS$ (by inscribed angle theorem)