Author note — to cover

Equal angles in the Z configuration between parallel lines: identify pairs on marked diagrams, find angles, and quote alternate angles are equal. Distinguish from corresponding and co-interior pairs, which have sibling pages; chains mixing several rules belong on Multi-step angle problems. Both tiers. (G3)

• Fluency — direct questions on alternate angles, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).