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In the adjoining figure, BM and DN are perpendiculars to the line segment AC. If BM = DN, prove that AC bisects BD.

In the adjoining figure, BM and DN are perpendiculars to the line segment AC. If BM = DN, prove that AC bisects BD. Triangles, ML Aggarwal Understanding Mathematics Solutions ICSE Class 9.

Triangles

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Answer

In △BEM and △DEN,

BM = DN (Given).

∠BME = ∠DNE (Both are equal to 90°)

∠BEM = ∠DEN (Vertically opposite angles)

∴ △BEM ≅ △DEN by AAS axiom.

We know that corresponding parts of congruent triangles are equal.

∴ DE = BE.

Since, DE = BE it means that AC bisects BD at E.

Hence, proved that AC bisects BD.

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