Geometryhard · Past Paper
Find the length of the tangent from (5, 4) to the circle x^2 + y^2 = 9.
A4
Bsqrt(32)
C5
Dsqrt(41)
✓ Correct Answer: B — sqrt(32)
Length = sqrt(x1^2 + y1^2 - r^2) = sqrt(5^2 + 4^2 - 9) = sqrt(25 + 16 - 9) = sqrt(32).
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