SSS, SAS, AAS, ASA, RHS Criteria for Congruency of Triangles
In the given ...
Question
In the given figure, BOC is a diameter of a circle with centre O. If AB and CD are two chords such that AB||CD and AB = 10 cm then CD = ?
(a) 5 cm
(b) 12.5 cm
(c) 15 cm
(d) 10 cm
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Solution
(d) 10 cm Draw OE ⊥ AB and OF ⊥ CD. In Δ OEB and ΔOFC, we have: OB = OC (Radius of a circle) ∠BOE = ∠COF (Vertically opposite angles) ∠OEB = ∠OFC (90° each) ∴ ΔOEB ≅ ΔOFC (By AAS congruency rule) ∴ OE = OF Chords equidistant from the centre are equal. ∴ CD = AB = 10 cm