prove the exterior angle sum property

1.	prove the exterior angle sum property
Answer» Given- ABC is a triangle in which side BC is produced to D.To prove- A+B=DProof-In triangle ABC by angle sum propertyA+B+C=180...........1Now,C+D=180.......( Linear pair)......2From 1&2A+B+C=D+CC&C will get cancelledA+B=D......................proved

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