If radii of two concentric circles are 4 cm and 5 cm then find the length of
the chord of one circle which is a tangent to the other circle.
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C is the center of two circles
A is the point of contact
In ∆ABC
By Pythagorean theorem
AB²+ AC² =BC²
AB² + 4² = 5²
AB² = 9
AB=3
Length of chord =2AB =6cm
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