johnthienann58
25.03.2021 •
Mathematics
10 cm side with vertices ABC
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Ответ:
1.A straight line measures 180 degrees
2.Alternate interior angles theorem
Step-by-step explanation:
We have to prove that
Sum of interior angles of any triangle =180 degrees
Proof:
1.
Reason: A straight line measures 180 degrees
2.
Reason:Alternate interior angles theorem
3.
Reason: by definition of congruent angles.
4.
Reason: By substitution
Hence, proved.