In the Given Figure, Oq : Pq = 3.4 and Perimeter of δ Poq = 60 Cm. Determine Pq, Qr and Op. - Mathematics

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Short Note

In the given figure, OQ : PQ = 3.4 and perimeter of Δ POQ = 60 cm. Determine PQ, QR and OP.

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Solution

In the figure,

∠ PQD. Therefore we can use Pythagoras theorem to find the side PO.

`PO^2=PQ^2+OQ^2` …… (1)

In the problem it is given that,

`(OQ)/(PQ)=3/4`

`OQ= 3/4PQ`.....(2)

Substituting this in equation (1), we have,

`PQ^2=(9PQ^2)/16+PQ^2`

`PQ^2=(25PQ^2)/16`

`PQ^2=sqrt((25PQ^2)/16)`

`PQ=5/4PQ`........(3)

It is given that the perimeter of  Δ POQis 60 cm. Therefore,

PQ + OQ + PO = 60

Substituting (2) and (3) in the above equation, we have,

`PQ+3/4PQ+5/4PQ=60`

`12/4PQ=60`

`3PQ=60`

`PQ=20`

Substituting for PQ in equation (2), we have,

`PD=5/4xx15`

`OQ=3/4xx20`

`OQ=15`

OQ is the radius of the circle and QR is the diameter. Therefore,

QR = 2OQ

QR = 30

Substituting for PQ in equation (3), we have,

`PD=5/4xx20`

`PO=25`

Thus we have found that PQ = 20 cm, QR = 30 cm and PO = 25 cm.

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Chapter 8: Circles - Exercise 8.2 [Page 40]

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RD Sharma Class 10 Maths
Chapter 8 Circles
Exercise 8.2 | Q 44 | Page 40

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