in figure QR is common tangent to the given circle touching externally at the point T. the tangent at T meets OR at P. if PT is 3.8, then the lenght of OR is
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Lengths of the tangents drawn from an external point to a circle are equal.
∴ QP = PT = 3.8 cm ............ (i)
PR = PT = 3.8 cm ............ (ii)
• From equations (i) and (ii) :
QP = PR = 3.8 cm
But, QR = QP + PR
∴ QR = 3.8 + 3.8
⇒ QR = 7.6 cm
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