Author note — to cover

Sector area as the angle over 360 applied to pi r squared and to nothing else — not to the circumference formula — with exact-pi and rounded answers, minor and major sectors. Both tiers under G18. Segment areas need the Higher formula half ab sin C, so they stay off Foundation. (G18)

• Fluency — direct questions on area of a sector, 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).