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Mathematics

1 answer:

vekshin13 years ago

5 0

Answer:

Since angle d, a, and e are supplementary, d+a+e =180 degrees.

Given that line LK and BC are parallel

By the alternate interior angle theorem, e=c and d=b.

Substitute:

d+a+e=b+a+c=180

Since b+a+c is the sum of the angles of triangle ABC, the sum of the interior angle of triangle ABC (which could be any triangle of any size and shape) is 180 degrees.

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