GCSE Maths Practice: congruence-and-similarity

Question 6 of 10

This question tests which transformations preserve congruence. Rotation is a key example.

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\( \begin{array}{l}\text{Which transformation preserves congruence?}\end{array} \)

Choose one option:

Rotation preserves all lengths and angles; check other transformations carefully.

Transformations can alter shapes in various ways. Congruence is preserved when the shape's size and angles remain identical. Rotation moves a shape around a point without changing its size or angles. In contrast, stretching or shearing changes side lengths or angles, so congruence is not maintained. Enlargement changes size but preserves similarity, not congruence. Understanding which transformations preserve congruence is crucial for geometric proofs, diagrams, and real-life applications like engineering and design. Practicing different transformations visually helps students quickly recognize congruence-preserving operations.