Big Ideas Math Integrated I, 2016
BI
Big Ideas Math Integrated I, 2016 View details
4. Proving Statements about Segments and Angles
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Exercise 53 Page 476

Vertical angles describe two angles with sides that form two pairs of opposite rays.

∠ 1 and ∠ 3

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Vertical angles describe two angles with sides that form two pairs of opposite rays. Examining the figure we see that only two angles fit this description, ∠ 1 and ∠ 3.