P1.3.2 - Radian measure,

Radian measure, including use for Use of the formulae s = rθ and A = 1 r2θ. arc length and area of sector.

Use radian measure, to connect the rule to the data and decision in the question.

This matters because radian measure, determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply radian measure, to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: Radian measure, is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.