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Big Ideas Math Integrated I, 2016 View details

2. Measuring and Constructing Segments

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Exercise 7 Page 390

The Segment Addition Postulate can only be used if we have three points on the same line.

No, the points are not collinear.

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The Segment Addition Postulate can be used to compute the length between two points if there is a third point between the points. The three points must be collinear, which means they have to be on the same line.

As we can see in the picture, the point Y is not between W and Z. Therefore, we cannot use the Segment Addition Postulate to find the distance between W and Z.