Author note — to cover

Two matched angles (AA) prove triangles similar: find the pairs in nested and bow-tie configurations using parallel-line angle facts, and show why one shared angle alone is insufficient. Formal statements with reasons expected. Length calculations move to the missing-lengths page. Both tiers. (G6, G19)

• Fluency — direct questions on proving two triangles similar, 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).