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Question

In a square PQRS, diagonals bisect each other at O. Prove that ΔPOQ ΔQOR ΔROS ΔSOP.

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Solution

Given: PQ = QR = RS = PS and SO = QO = PO = RO

To Prove: ΔPOQ ΔQOR ΔROS ΔSOP

Proof:

In ΔSOR and ΔPOQ:

SR = PQ (Given)

RO = PO (Given)

SO = OQ (Given)

∴ ΔSOR ΔPOQ … (1) (SSS congruency)

In ΔPOS and ΔROQ:

PS = QR (Given)

PO = OR (Given)

SO = OQ (Given)

∴ ΔSOP ΔROQ … (2) (SSS congruency)

In ΔPOS and ΔROS:

PS = SR (Given)

OS = OS (Common)

PO = OR (Given)

∴ ΔPOS ROS … (3) (SSS congruency)

In ΔPOQ and ΔROQ:

PQ = QR (Given)

OQ = OQ (Common)

PO = OR (Given)

∴ ΔPOQ ROQ … (4) (SSS congruency)

From (1), (2), (3) and (4):

ΔPOQ ΔQOR ΔROS ΔSOP


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