Determine the angle in isosceles triangle — task. Mathematics State Board, Class 7.

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In the following isosceles triangle

$ABC$ , the exterior angle

$∠A = 80°$ and

$BC$ is the unequal side. Calculate interior angles

$∠B$ and

$∠C$ .

1.

$∠B =$

$°$ .

2.

$∠C =$

$°$ .

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