Author note — to cover

Reflect shapes in given mirror lines on and off axes: vertical and horizontal lines x = a and y = b, plus the diagonals y = x and y = minus x; images congruent, points on the mirror unmoved. Describing a given reflection fully belongs to Describing a transformation. Both tiers. (G7)

• Fluency — direct questions on reflection, 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).