Exemplar exercise problems I — task. Mathematics CBSE, Class 10.

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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:

$9 \ cm$
$3 \ cm$
$1 \ cm$
$6 \ cm$

2. In figure, if

$\angle AOB = 125^\circ$ , then

$\angle COD$ is equal to

$35^\circ$
$45^\circ$
$62.5^\circ$
$55^\circ$

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