C.4.4—Pythagoras and triangle angles

Use Pythagoras' theorem and the angle sum of a triangle, including resultant-vector calculations.

Use c.4.4—pythagoras and triangle angles to connect the rule to the data and decision in the question.

This matters because c.4.4—pythagoras and triangle angles determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply c.4.4—pythagoras and triangle angles to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: C.4.4—Pythagoras and triangle angles is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.