2. A line is determined by three or more points that extend infinitely in both directions.
3. Line segments can be labeled with three letters.
4. The middle letter in the name of an angle is the vertex.
5. In labeling a ray, the arrowhead should be above the letter which represents the end that extends infinitely.
6.
7.
8. Perpendicular lines intersect.
9. Parallel lines intersect.
10. Right angles measure almost 90 degrees.
11. Two acute angles combined can have a total measure that can form one obtuse angle.
12. A straight angle is also an obtuse angle.
13. If a line segment or a line has three points, it can be considered an angle.
14. The sum of all the angles in a triangle is 180 degrees.
15. The sum of all the angles is any quadrilateral is twice that of a triangle.
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