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Big Ideas Math Integrated I, 2016 View details

3. Postulates and Diagrams

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Exercise 19 Page 463

Vertical angles are formed when the sides of the two angles form two pairs of opposite rays.

Yes.

Practice makes perfect

Let's highlight ∠ NKL and ∠ JKM in the diagram.

Since MN and JL intersect at Point K, and the sides of the two angles form two pairs of opposite rays, we can assume that ∠ NKL and ∠ JKM are vertical angles.