Harvey schools â Thornton Township High School is located at 15001 Broadway Ave, Harvey IL 60426. 15001 Broadway Ave is in the 60426 ZIP code in Harvey, IL The school district for Thornton Township High School is the Thornton Twp Hsd 205.
In the diagram shown above, we see triangle ABC and the dotted line through A that is parallel to BC. Since angle A, from the triangle, and angles 1 and 2 form a straight (dotted) line, the sum of their measures is 180Âº. We also know that since the dotted line is parallel to BC that by alternate interior angles. Theorem: The sum of the three angles in a triangle is always 180Âº.
180 degrees minus interior angle = exterior angle and that the 3 exterior angles of a triangle add up to 360 degrees.