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tmua.fyi Mock Paper 1 · Q6

Paper 1GeometryAlgebra

The circle CC has equation x2+y2−6x+8y+21=0x^2+y^2-6x+8y+21=0. Find the length of the tangent to CC drawn from the origin.

A13\sqrt{13}
B5\sqrt5
C2121
D29\sqrt{29}
E21\sqrt{21}

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