UPSKILL MATH PLUS

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1. 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:
 
2. In figure, if \(\angle AOB = 125^\circ\), then \(\angle COD\) is equal to
YCIND_240308_6083_circles_12.png