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JEE Mains · Maths · STD 11 - 10.1 circle and system of circle

यदि वृत्त \(x ^{2}+ y ^{2}= r ^{2}( r >0)\) की, रेखा \(y -2 x =3\) के अनुदिश, जीवा की लम्बाई \(r\) है, तो \(r ^{2}\) बराबर है 

  1. A \(\frac{9}{5}\)
  2. B \(\frac{12}{5}\)
  3. C \(12\)
  4. D \(\frac{24}{5}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\frac{12}{5}\)

Step-by-step Solution

Detailed explanation

Let chord \(A B=r\) \(\because \Delta AOM\) is right angled triangle \(\therefore OM =\frac{ r \sqrt{3}}{2}=\) perpendicular distance of line \(AB\) from (0,0) \(\frac{r \sqrt{3}}{2}=\left|\frac{3}{\sqrt{5}}\right|\) \(r^{2}=\frac{12}{5}\)
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