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3 years ago

Given: ΔABC

Mathematics

2 answers:

erastovalidia [21]3 years ago

5 0

Answer:

Alternate interior angles.

Step-by-step explanation:

We have been asked to find the missing reason of flowchart, which proves that the measure of interior angles of ΔABC is 180°.

We have been given that by Construction, line segment DE is parallel to line segment AC and we can see line AB as a transversal.

Since we know that angles formed by inside of two parallel lines and opposite side a transversal are known as alternate interior angles.

We can see that angle DBA and BAC are formed inside parallel line segments DE and AC and opposite side of line segment AB. Therefore, angle DBA and BAC are congruent by alternate interior angles.

vovangra [49]3 years ago

4 0

Answer:

angle addition postulute

Step-by-step explanation:

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