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Gresty Academy Paper 1 · Q5

Paper 1GeometryAlgebra

The equation of a circle centred at the origin with tangent y=mx+cy=mx+c is

Ax2+y2=c2+m2x^2+y^2=c^2+m^2
Bx2+y2=c2−m2x^2+y^2=c^2-m^2
Cx2+y2=c2m2−1x^2+y^2=\frac{c^2}{m^2-1}
Dx2+y2=c2m2+1x^2+y^2=\frac{c^2}{m^2+1}

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