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Maharashtra State BoardSSC (English Medium) 9th Standard

Diagonals PR and QS of a rhombus PQRS are 20 cm and 48 cm respectively. Find the length of side PQ. - Geometry

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Question

Diagonals PR and QS of a rhombus PQRS are 20 cm and 48 cm respectively. Find the length of side PQ.

Sum

Solution

Diagonals of a rhombus bisect each other at right angles. 

PR = 20 cm, QS = 48 cm

⇒ `"PO" = 1/2 "PR"`

= `1/2 xx 20`

= 10 cm

Similarly, QS = 48 cm

⇒ `"QO" = 1/2 "SQ"`

= `1/2 xx 48`

= 24 cm

In ΔPOQ, applying Pythagoras theorem,

OQ2 + QP2 = PQ2

⇒ 242 + 102 = PQ2

⇒ PQ2 = 576 + 100

⇒ PQ2 = 676

⇒ PQ = 26 cm

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Chapter 5: Quadrilaterals - Problem Set 5 [Page 74]

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