Author note — to cover

Cross-section area times length for any right prism — a G16 formula to know — identifying the repeating face first, with triangular, trapezoidal and L-shaped cross-sections. Cylinders follow as the circular case; oblique solids are beyond GCSE and the frustum is the Higher page. Both tiers. (G16)

• Fluency — direct questions on volume of a prism, 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).