Mathematics · Triangles · NCERT Examples

Example 4

A complete, independently verified solution for NCERT Example 4.

Mathematics · Chapter 6 · NCERT Examples

Verified NCERT questions and solutionsSolutions are checked independently and follow the supplied NCERT chapter edition.

NCERT Example

Example 4

In Figure 6.29, PQ ∥ RS. Prove that △POQ ∼ △SOR.

Lines PQ and RS are parallel; segments PS and QR intersect at O, forming triangles POQ and SOR.
Figure 6-29 from the supplied NCERT chapter.

Solution

Given:

PQ is parallel to RS, and the intersecting lines meet at O.

To prove:

Triangle POQ is similar to triangle SOR.

Lines PQ and RS are parallel; segments PS and QR intersect at O, forming triangles POQ and SOR.
Figure 6-29 from the supplied NCERT chapter.

Proof:

∠OPQ=∠OSR\angle OPQ=\angle OSR

Alternate interior angles, since PQ is parallel to RS.

∠OQP=∠ORS\angle OQP=\angle ORS

Alternate interior angles, since PQ is parallel to RS.

∠POQ=∠SOR\angle POQ=\angle SOR

Vertically opposite angles.

Thus the correspondence is P ↔ S, O ↔ O and Q ↔ R.

Therefore, △POQ ∼ △SOR by the AAA similarity criterion.

Final answer

Therefore, △POQ ∼ △SOR.

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