Big Ideas Math Integrated I, 2016
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Big Ideas Math Integrated I, 2016 View details
1. Points, Lines, and Planes
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Exercise 13 Page 384

For two rays to be the same, they must have the same endpoint and direction.

AC

Practice makes perfect

The ray AE has endpoint A and goes through E before continuing on indefinitely.

For two rays to be the same, they must have the same endpoint and point in the same direction. Therefore, we need to use A as the endpoint when creating an alternative name. For the point giving the direction, we can use C instead since it lies on AE. An alternative name for AE is then AC — they have the same endpoint and direction.