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Please find the solution:
Join OT. Let it intersect PQ at the point R.
Then ΔTPQ is isosceles and TO is the angle bisector of ∠PTQ.
So, OT⟂ PQ and therefore,
OT bisects PQ which gives PR = RQ = 4 cm.
Join OT. Let it intersect PQ at the point R.
Then ΔTPQ is isosceles and TO is the angle bisector of ∠PTQ.
So, OT⟂ PQ and therefore,
OT bisects PQ which gives PR = RQ = 4 cm.