Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to understand euclidean geometry [title] Learn postulate 1-a line segment can be formed by joining any two points. [step] If you have two points, a and b, you can draw a line segment connecting those two points. Only one line segment can ever be made by connecting the two points.

Ending1: This line segment cannot be made to the left or right of those two points. [title] Draw a line segment between independent lines. Ending2: [title] Know postulate 2-any line segment can be extended toward infinity in either direction. [step] Once you have constructed a line segment between two points, you can extend this line segment into a line. Ending3: [title] Draw parallel lines from the beginning of a sentence to the end of the next line. [step] This will be the intersection where the lines from the initial sentence end. Ending4: [title] Think of the 0 and 2 points in a line segment. [step] For example, imagine you have both h and c on your pencil.

Answer format: ending1/ending2/ending3/ending4