Shape Classification: Angles are used to classify shapes (like triangles being acute, right, or obtuse).

Measurement and Construction: Accurately measuring and constructing shapes requires knowing the correct angles.

Symmetry and Congruence: Angles help identify symmetry and congruence between shapes.

Calculating Dimensions: In polygons, knowing the angles helps calculate side lengths and areas (like in triangles using trigonometry).

Problem Solving: Angles are fundamental when solving problems related to parallel lines, transversals, and interior/exterior angles.