Interior angles of a triangle equal 180 degrees

- The interior angles of a triangle equal 180 degrees is an example of ____ knowledge
- The three interior inside angles of a triangle are equal to 180 degrees
- The sum of the interior angles of a triangle is equal to 180 degrees
- The sum of a triangle's interior angles must equal 180 degrees
- The sum of the 3 interior angles of a triangle is always equal to 180 degrees