If radii of two concentric circles are 4 cm and 5 cm, then the length of each chord of one circle which is tangent to the other circle is
A. 3 cm
B. 6 cm
C. 9 cm
D. 1 cm
Answer:B
If radii of two concentric circles are 4 cm and 5 cm, then the length of each chord of one circle which is tangent to the other circle is
A. 3 cm B. 6 cm C. 9 cm D. 1 cm