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Prove that the diagonals of a trapezium divide each other proportionally. - Mathematics

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प्रश्न

Prove that the diagonals of a trapezium divide each other proportionally.

योग
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उत्तर

Given: In trapezium ABCD, AB || CD. Diagonals AC and BD intersect at O.

In △AOB and △COD:

  • ∠ABO = ∠CDO (alternate interior angles, since AB || CD)
  • ∠AOB = ∠COD (vertically opposite angles)

⇒ △AOB ∼ △COD (by AA similarity)

Therefore, corresponding sides are proportional:

`(AO)/(OC) = (BO)/(OD)`

Hence proved that the diagonals of a trapezium divide each other proportionally.

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अध्याय 13: Similarity - CHAPTER TEST [पृष्ठ २९३]

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नूतन Mathematics [English] Class 10 ICSE
अध्याय 13 Similarity
CHAPTER TEST | Q 5. | पृष्ठ २९३
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