AMC / AIME · Power of a Point · Medium

Power of a Point: External secant: external part math, whole secant math. Tangent length?

Chord and tangent-secant.

Try the problem

External secant: external part 55, whole secant 2020. Tangent length?

Hint and answer

Concept to use

Tangent-secant.

Hint

t2=5⋅20t^2=5\cdot 20.

Answer

10

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