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.
Definition of an exterior angle. At each vertex of a triangle, an exterior angle of the triangle may be formed by extending ONE SIDE of the triangle. See picture below. Calculating the Angles. We can use equations to represent the measures of the angles described above. One equation might tell us the sum of the angles of the triangle. For example, x + y + z = 180. We know this is true, because the sum of the angles inside a triangle is always 180 degrees. What is w? We don't know yet. But, we may observe that the measure of angle w plus the measure of angle z = 180 degrees, because they are a pair of supplementary angles.