10-1.Circle and System of Circles
hard

જો ધન $x-$અક્ષ તથા વર્તુળ $(x-2)^{2}+(y-3)^{2}=25$ ના $(5, 7)$ બિંદુએ અભિલંબ અને સ્પર્શકથી બનતા ત્રિકોણનું ક્ષેત્રફળ $A$ હોય, તો $24A =........ .$

A

$1140$

B

$1225$

C

$2450$

D

$612$

(JEE MAIN-2021)

Solution

Equation of normal $4 x-3 y+1=0$

and equation of tangents $3 x+4 y-43=0$

Area of triangle $=\frac{1}{2}\left(\frac{43}{3}+\frac{1}{4}\right) \times(7)$

$=\frac{1}{2}\left(\frac{172+3}{12}\right) \times 7$

$A =\frac{1225}{24}$

$24 A =1225$

Standard 11
Mathematics

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