Big Ideas Math Integrated I, 2016
BI
Big Ideas Math Integrated I, 2016 View details
1. Pairs of Lines and Angles
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Exercise 7 Page 501

Parallel lines are usually marked with arrowheads.

MK and LS

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Parallel lines are usually marked with arrowheads: ▶. Looking at the coordinate plane, we can see two of these symbols.

Therefore, MK and LS are parallel.