I can't understand the question

1) If a line intersects to concentric circle with centre O at A, B, C, and D. prove that AB = CD.

Dear Student,

Given: Two concentric circles with centre O, line l intersects the two circles at A, B, C, and DTo prove: AB = CDConstruction: Drop a perpendicular from O to line l intersecting it at M.Proof: OM  BC      [By construction] BM = MC             [Perpendicular from centre of a circle to a chord bisects the chord]    ...iOM  AD                   [By construction] AM = MD             [Perpendicular from centre of a circle to a chord bisects the chord]    ...ii AM - BM = MD - MC      [From i and ii] AB = CDHence, proved

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