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Pa And Pb Are Tangents To The Circle At A And B Respectively And The Chord Bc Is Parallel To Tangent Pa. If Ac = 6 Cm, And Length Of The Tangent Ap Is 9 Cm, Then What Is The Length Of The Chord Bc? |
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Answer» PA = PB = 9 cm ( LENGTH of tangents from an external point) Angle PAB = Angle ABC ( alternate angles PA !! BC) Triangles PAB and ACB are isosceles and sre similar triangles ( They are equiangular) TAKING the ratios of respective sides BC/AB = AC/PB BC/6 = 6/9 BC = 4 cm PA = PB = 9 cm ( Length of tangents from an external point) Angle PAB = Angle ABC ( alternate angles PA !! BC) AC = AB = 6 cm Triangles PAB and ACB are isosceles and sre similar triangles ( They are equiangular) Taking the ratios of respective sides BC/AB = AC/PB BC/6 = 6/9 BC = 4 cm |
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