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02-12-2017
Mathematics

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Determine the measures of the unknown (labeled) angles.

Determine the measures of the unknown labeled angles class=

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02-12-2017

Look at the lower smaller triangle: a=180-58-69=53
Look at the larger triangle: the two interior angle a and b add up to equal the exterior angle which is 93 degree, so a+b=93, b=93-a=93-53=40

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