In the given figure, two concentric circles with centre O are given. If the perpendicular from O is drawn on to AD. If AD = 20 cm and BC = 15 cm then find the value of AB. Share with your friends Share 1 Varun.Rawat answered this We have OM⊥AD.We know that ⊥ drawn from the centre of the circle to the chord bisects the chord.Since, AD is the chord of bigger circle and OM⊥AD, thenAM = MD = AD2 ....1Since, BC is the chord of smaller circle and OM⊥⊥BC, thenBM = MC = BC2 .....2Now, AM = MD = AD2 = 202 = 10 cm as, AD = 20 cmNow, BM = MC = BC2 = 152 = 7.5 cm As, BC = 15 cmNow, AB = AM - BM = 10 - 7.5 = 2.5 cm 0 View Full Answer Tushar Saini answered this prove that the tangent at any point of a circle is perpendicular to the radius 0 Arpit Ghosh Roy answered this Yes 0
