Big Ideas Math Integrated I, 2016
BI
Big Ideas Math Integrated I, 2016 View details
1. Points, Lines, and Planes
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Exercise 59 Page 386

Do planes intersect along lines? Do they always intersect somewhere?

Sometimes

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When two non-parallel planes intersect, they always do so along a line. Two planes could, however, be parallel and have some distance between them. If so, they would never intersect. Thus, two planes sometimes intersect in a line.