10-1.Circle and System of Circles
hard

અહી $B$ એ વર્તુળ $x^{2}+y^{2}-2 x+4 y+1=0$ નું કેન્દ્ર છે. અહી બે બિંદુઓ $\mathrm{P}$ અને $\mathrm{Q}$ આગળના સ્પર્શકો બિંદુ $\mathrm{A}(3,1)$ આગળ છેદે છે તો  $8.$ $\left(\frac{\text { area } \triangle \mathrm{APQ}}{\text { area } \triangle \mathrm{BPQ}}\right)$ ની કિમંત મેળવો.

A

$18$

B

$36$

C

$72$

D

$12$

(JEE MAIN-2021)

Solution

$\tan \theta=\frac{3}{2}$

$\frac{\text { Area } \Delta \mathrm{APQ}}{\text { Area } \Delta \mathrm{BPQ}}=\frac{\mathrm{AR}}{\mathrm{RB}}=\frac{3 \sin \theta}{2 \cos \theta}=\frac{9}{4}$

$8\left(\frac{\text { Area } \Delta \mathrm{APQ}}{\text { Area } \Delta \mathrm{BPQ}}\right)=18$

Standard 11
Mathematics

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