Author note — to cover

Rearrange the arc and sector formulas to recover the angle from a stated arc length or area, or the radius, as G18's angles explicitly allows, checking answers against 360. Requires confident rearrangement; the forward calculations are the two sibling pages. Both tiers. (G18)

• Fluency — direct questions on finding the angle 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).