GKFix MCQ Question

In the derivation, why are right triangles (like ΔNOM, ΔNCM, ΔNIM) formed using point M?

• A. To define the angles i and r in terms of side ratios (like tan) for small angle approximation
• B. To measure the height of the object
• C. To ensure the surface is perfectly spherical
• D. To apply Pythagoras' theorem