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16-04-2018
Mathematics

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Prove that the sum of the measures of the interior angles of a triangle is 180°. Be sure to create and name the appropriate geometric figures.

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SINAZEUS SINAZEUS

16-04-2018

look at the picture showing triangle ABC

D || BC

so according to parallel lines theorem

angle 1 = angle B

angle 3 = angle C

angle 2 = angle A

1+2+3=180

then:

B+A+C=180

hope you understand it

good luck

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