in the figure QR is a common tangent to a given circle which meet at T. Tangent at TR meets QR at P. if QP refer question 25
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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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