The radii of two circles with the same centre are 7 cm and 25 cm. A chord of the bigger circle just touches the smaller circle. How long is this chord? (answer in cm)

Question

Accepted Answer

48. The chord is tangent to the smaller circle, so its distance from the centre is 7 cm. Half chord = √(25² − 7²) = √576 = 24, so the chord = 48.

The radii of two circles with the same centre are 7 cm and 25 cm. A chord of the bigger circle just touches the smaller circle. How long is this chord? (answer in cm)

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