Big Ideas Math Integrated I, 2016
BI
Big Ideas Math Integrated I, 2016 View details
3. Postulates and Diagrams
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Exercise 6 Page 462

The sign ⊥ means perpendicular.

See solution.

Practice makes perfect
From the diagram, we see that AB is on plane T and BC is on plane S. We also see that AB is perpendicular to plane S.

Therefore, we know that BC⊥ AB.