Let \theta be the angle between the circles S \equiv x^2+y^2+2 x-2 y+c=0 and S^1 \equiv x^2+y^2-6 x-8 y+9=0. If c is an integer and \cos \theta=\frac{5}{16} then the radius of the circle {\S}=0 is [AP EAPCET 22 May 2025 S1]

Circle

Section: Mathematics

Question : 25 of 89

Marks: +1, -0

Let θ be the angle between the circles S≡x2+y2+2x−2y+c=0 and S1≡x2+y2−6x−8y+9=0. If c is an integer and cos‌θ=‌

then the radius of the circle S=0 is

[AP EAPCET 22 May 2025 S1]

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