Exemplar Exercise Problems III — task. Mathematics CBSE, Class 9.

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1. In the figure, if

$AOB$ is a diameter of the circle and

$AC = BC$ , then

$∠CAB$ is equal to:

$90^º$
$60^º$
$30^º$
$45^º$

2. In the figure, if

$∠OAB = 40^°$ , then

$∠ACB$ is equal to :

$60^°$
$40^°$
$70^°$
$50^°$

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