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December 22, 2014

December 22, 2014

Posted by **mazoe** on Monday, February 27, 2012 at 3:50am.

(i)Find the centre and radius of the circle

(ii)Determine whether the line x-3y=8 is tangent to the given circle

- maths -
**Henry**, Wednesday, February 29, 2012 at 3:49pm1. x^2+2x+(2/2)^2+Y^2-8y+(-8/2)^2=-5+1+16.

X^2+2x+1 + Y^2-8y+16 = 12.

(x+1)^2 + (y-4)^2 = 12.

(x-h)^2 + (y-k)^2 = r^2.

C(h,k).

C(-1,4).

r^2 = 12.

r = 2*sqrt3 = 3.46.

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