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

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1. In the figure, if

$∠DAB = 60^°$ ,

$∠ABD = 50^°$ , then

$∠ACB$ is equal to:

$80^°$
$50^°$
$70^°$
$60^°$

2.

$ABCD$ is a cyclic quadrilateral such that

$AB$ is a diameter of the circle circumscribing it and

$∠ADC = 140^°$ , then

$∠BAC$ is equal to

$30^°$
$40^°$
$80^°$
$50^°$

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