Author note — to cover

Choose the ratio linking the known angle and given side to the wanted side, multiplying when the unknown is the numerator and dividing when it is the denominator, calculator in degrees mode. Right-angled triangles only, diagrams in all orientations; angles come next. Both tiers. (G20)

• Fluency — direct questions on finding a side with trigonometry, 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).