Geometryhard · Past Paper
Two concentric circles have radii 5 cm and 3 cm. Find the length of the chord of the larger circle which touches the smaller circle.
A4 cm
B8 cm
C10 cm
D6 cm
✓ Correct Answer: B — 8 cm
This chord is a tangent to the inner circle. Length = 2 * sqrt(R^2 - r^2) = 2 * sqrt(5^2 - 3^2) = 2 * 4 = 8 cm.
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