Web Reference: 64° 2x - 1 x + 9 Answers Bubble in your answers below Reflection: From this activity, I learned... for problems #8-14. The Triangle Sum Theorem, also known as the Angle Sum Theorem for a triangle, states that the sum of the three interior angles of any triangle is always equal to 180 degrees. Click the images below to open each PDF worksheet with answer keys and get your triangle geometry practice started! These triangle worksheets make use of the Triangle Sum Theorem which states that the sum of the interior angles of a triangle is always 180 degrees.
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