Author note — to cover

The converse of Pythagoras: test whether a squared plus b squared equals c squared for the three given sides, c the longest, before claiming or denying a right angle, with Pythagorean triples and scaled triples featured. State the conclusion alongside the test. Both tiers. (G20)

• Fluency — direct questions on testing for a right angle, 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).